diff -aruN a/include/boost/beast/core/detail/impl/read.hpp b/include/boost/beast/core/detail/impl/read.hpp
--- a/include/boost/beast/core/detail/impl/read.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/core/detail/impl/read.hpp	2020-05-02 13:50:11.141761700 -0400
@@ -214,7 +214,7 @@
     class AsyncReadStream,
     class DynamicBuffer,
     class CompletionCondition,
-    class ReadHandler,
+    BOOST_BEAST_ASYNC_TPARAM2 ReadHandler,
     class>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 async_read(
diff -aruN a/include/boost/beast/core/detail/is_invocable.hpp b/include/boost/beast/core/detail/is_invocable.hpp
--- a/include/boost/beast/core/detail/is_invocable.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/core/detail/is_invocable.hpp	2020-05-02 13:50:11.141761700 -0400
@@ -10,6 +10,8 @@
 #ifndef BOOST_BEAST_DETAIL_IS_INVOCABLE_HPP
 #define BOOST_BEAST_DETAIL_IS_INVOCABLE_HPP
 
+#include <boost/asio/async_result.hpp>
+#include <boost/type_traits/make_void.hpp>
 #include <type_traits>
 #include <utility>
 
@@ -51,6 +53,26 @@
 };
 /** @} */
 
+template<class CompletionToken, class Signature, class = void>
+struct is_completion_token_for : std::false_type
+{
+};
+
+struct any_initiation
+{
+    template<class...AnyArgs>
+    void operator()(AnyArgs&&...);
+};
+
+template<class CompletionToken, class R, class...Args>
+struct is_completion_token_for<
+    CompletionToken, R(Args...), boost::void_t<decltype(
+        boost::asio::async_initiate<CompletionToken, R(Args...)>(
+            any_initiation(), std::declval<CompletionToken&>())
+        )>> : std::true_type
+{
+};
+
 } // detail
 } // beast
 } // boost
diff -aruN a/include/boost/beast/core/detail/read.hpp b/include/boost/beast/core/detail/read.hpp
--- a/include/boost/beast/core/detail/read.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/core/detail/read.hpp	2020-05-02 13:50:11.142761711 -0400
@@ -219,7 +219,7 @@
     class AsyncReadStream,
     class DynamicBuffer,
     class CompletionCondition,
-    class ReadHandler
+    BOOST_BEAST_ASYNC_TPARAM2 ReadHandler
 #if ! BOOST_BEAST_DOXYGEN
     , class = typename std::enable_if<
         is_async_read_stream<AsyncReadStream>::value &&
diff -aruN a/include/boost/beast/core/detect_ssl.hpp b/include/boost/beast/core/detect_ssl.hpp
--- a/include/boost/beast/core/detect_ssl.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/core/detect_ssl.hpp	2020-05-02 13:50:11.143761722 -0400
@@ -374,13 +374,13 @@
     void operator()(
         DetectHandler&& h,
         AsyncReadStream* s, // references are passed as pointers
-        DynamicBuffer& b)
+        DynamicBuffer* b)
     {
         detect_ssl_op<
             typename std::decay<DetectHandler>::type,
             AsyncReadStream,
             DynamicBuffer>(
-                std::forward<DetectHandler>(h), *s, b);
+                std::forward<DetectHandler>(h), *s, *b);
     }
 };
 
@@ -439,7 +439,7 @@
             detail::run_detect_ssl_op{},
             token,
             &stream, // pass the reference by pointer
-            buffer);
+            &buffer);
 }
 
 //]
diff -aruN a/include/boost/beast/core/impl/basic_stream.hpp b/include/boost/beast/core/impl/basic_stream.hpp
--- a/include/boost/beast/core/impl/basic_stream.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/core/impl/basic_stream.hpp	2020-05-02 13:50:11.144761733 -0400
@@ -776,7 +776,7 @@
 //------------------------------------------------------------------------------
 
 template<class Protocol, class Executor, class RatePolicy>
-template<class ConnectHandler>
+template<BOOST_BEAST_ASYNC_TPARAM1 ConnectHandler>
 BOOST_BEAST_ASYNC_RESULT1(ConnectHandler)
 basic_stream<Protocol, Executor, RatePolicy>::
 async_connect(
@@ -795,7 +795,7 @@
 template<class Protocol, class Executor, class RatePolicy>
 template<
     class EndpointSequence,
-    class RangeConnectHandler,
+    BOOST_ASIO_COMPLETION_TOKEN_FOR(void(error_code, typename Protocol::endpoint)) RangeConnectHandler,
     class>
 BOOST_ASIO_INITFN_RESULT_TYPE(RangeConnectHandler,void(error_code, typename Protocol::endpoint))
 basic_stream<Protocol, Executor, RatePolicy>::
@@ -817,7 +817,7 @@
 template<
     class EndpointSequence,
     class ConnectCondition,
-    class RangeConnectHandler,
+    BOOST_ASIO_COMPLETION_TOKEN_FOR(void(error_code, typename Protocol::endpoint)) RangeConnectHandler,
     class>
 BOOST_ASIO_INITFN_RESULT_TYPE(RangeConnectHandler,void (error_code, typename Protocol::endpoint))
 basic_stream<Protocol, Executor, RatePolicy>::
@@ -839,7 +839,7 @@
 template<class Protocol, class Executor, class RatePolicy>
 template<
     class Iterator,
-    class IteratorConnectHandler>
+    BOOST_ASIO_COMPLETION_TOKEN_FOR(void(error_code, Iterator)) IteratorConnectHandler>
 BOOST_ASIO_INITFN_RESULT_TYPE(IteratorConnectHandler,void (error_code, Iterator))
 basic_stream<Protocol, Executor, RatePolicy>::
 async_connect(
@@ -860,7 +860,7 @@
 template<
     class Iterator,
     class ConnectCondition,
-    class IteratorConnectHandler>
+    BOOST_ASIO_COMPLETION_TOKEN_FOR(void(error_code, Iterator)) IteratorConnectHandler>
 BOOST_ASIO_INITFN_RESULT_TYPE(IteratorConnectHandler,void (error_code, Iterator))
 basic_stream<Protocol, Executor, RatePolicy>::
 async_connect(
@@ -881,7 +881,7 @@
 //------------------------------------------------------------------------------
 
 template<class Protocol, class Executor, class RatePolicy>
-template<class MutableBufferSequence, class ReadHandler>
+template<class MutableBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 basic_stream<Protocol, Executor, RatePolicy>::
 async_read_some(
@@ -901,7 +901,7 @@
 }
 
 template<class Protocol, class Executor, class RatePolicy>
-template<class ConstBufferSequence, class WriteHandler>
+template<class ConstBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 basic_stream<Protocol, Executor, RatePolicy>::
 async_write_some(
diff -aruN a/include/boost/beast/core/impl/buffered_read_stream.hpp b/include/boost/beast/core/impl/buffered_read_stream.hpp
--- a/include/boost/beast/core/impl/buffered_read_stream.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/core/impl/buffered_read_stream.hpp	2020-05-02 13:50:11.144761733 -0400
@@ -110,7 +110,7 @@
     operator()(
         ReadHandler&& h,
         buffered_read_stream* s,
-        Buffers const& b)
+        Buffers const* b)
     {
         // If you get an error on the following line it means
         // that your handler does not meet the documented type
@@ -124,7 +124,7 @@
         read_op<
             Buffers,
             typename std::decay<ReadHandler>::type>(
-                std::forward<ReadHandler>(h), *s, b);
+                std::forward<ReadHandler>(h), *s, *b);
     }
 };
 
@@ -141,7 +141,7 @@
 }
 
 template<class Stream, class DynamicBuffer>
-template<class ConstBufferSequence, class WriteHandler>
+template<class ConstBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 buffered_read_stream<Stream, DynamicBuffer>::
 async_write_some(
@@ -153,7 +153,7 @@
     static_assert(net::is_const_buffer_sequence<
         ConstBufferSequence>::value,
             "ConstBufferSequence type requirements not met");
-    static_assert(detail::is_invocable<WriteHandler,
+    static_assert(detail::is_completion_token_for<WriteHandler,
         void(error_code, std::size_t)>::value,
             "WriteHandler type requirements not met");
     return next_layer_.async_write_some(buffers,
@@ -212,7 +212,7 @@
 }
 
 template<class Stream, class DynamicBuffer>
-template<class MutableBufferSequence, class ReadHandler>
+template<class MutableBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 buffered_read_stream<Stream, DynamicBuffer>::
 async_read_some(
@@ -233,7 +233,7 @@
             typename ops::run_read_op{},
             handler,
             this,
-            buffers);
+            &buffers);
 }
 
 } // beast
diff -aruN a/include/boost/beast/core/impl/flat_stream.hpp b/include/boost/beast/core/impl/flat_stream.hpp
--- a/include/boost/beast/core/impl/flat_stream.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/core/impl/flat_stream.hpp	2020-05-02 13:50:11.145761743 -0400
@@ -144,7 +144,7 @@
 template<class NextLayer>
 template<
     class MutableBufferSequence,
-    class ReadHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 flat_stream<NextLayer>::
 async_read_some(
@@ -225,7 +225,7 @@
 template<class NextLayer>
 template<
     class ConstBufferSequence,
-    class WriteHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 flat_stream<NextLayer>::
 async_write_some(
diff -aruN a/include/boost/beast/_experimental/http/impl/icy_stream.hpp b/include/boost/beast/_experimental/http/impl/icy_stream.hpp
--- a/include/boost/beast/_experimental/http/impl/icy_stream.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/_experimental/http/impl/icy_stream.hpp	2020-05-02 13:50:11.146761754 -0400
@@ -259,7 +259,7 @@
 template<class NextLayer>
 template<
     class MutableBufferSequence,
-    class ReadHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 icy_stream<NextLayer>::
 async_read_some(
@@ -311,7 +311,7 @@
 template<class NextLayer>
 template<
     class MutableBufferSequence,
-    class WriteHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 icy_stream<NextLayer>::
 async_write_some(
diff -aruN a/include/boost/beast/_experimental/test/impl/stream.hpp b/include/boost/beast/_experimental/test/impl/stream.hpp
--- a/include/boost/beast/_experimental/test/impl/stream.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/_experimental/test/impl/stream.hpp	2020-05-02 13:50:11.147761765 -0400
@@ -306,7 +306,7 @@
     return 0;
 }
 
-template<class MutableBufferSequence, class ReadHandler>
+template<class MutableBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 stream::
 async_read_some(
@@ -386,7 +386,7 @@
     return n;
 }
 
-template<class ConstBufferSequence, class WriteHandler>
+template<class ConstBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 stream::
 async_write_some(
diff -aruN a/include/boost/beast/http/field.hpp b/include/boost/beast/http/field.hpp
--- a/include/boost/beast/http/field.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/http/field.hpp	2020-05-02 13:50:11.149761786 -0400
@@ -396,12 +396,9 @@
 string_to_field(string_view s);
 
 /// Write the text for a field name to an output stream.
-inline
+BOOST_BEAST_DECL
 std::ostream&
-operator<<(std::ostream& os, field f)
-{
-    return os << to_string(f);
-}
+operator<<(std::ostream& os, field f);
 
 } // http
 } // beast
diff -aruN a/include/boost/beast/http/impl/field.ipp b/include/boost/beast/http/impl/field.ipp
--- a/include/boost/beast/http/impl/field.ipp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/http/impl/field.ipp	2020-05-02 13:50:11.150761798 -0400
@@ -11,10 +11,12 @@
 #define BOOST_BEAST_HTTP_IMPL_FIELD_IPP
 
 #include <boost/beast/http/field.hpp>
+#include <boost/assert.hpp>
 #include <algorithm>
 #include <array>
 #include <cstring>
-#include <boost/assert.hpp>
+#include <ostream>
+
 
 namespace boost {
 namespace beast {
@@ -565,6 +567,12 @@
     return detail::get_field_table().string_to_field(s);
 }
 
+std::ostream&
+operator<<(std::ostream& os, field f)
+{
+    return os << to_string(f);
+}
+
 } // http
 } // beast
 } // boost
diff -aruN a/include/boost/beast/http/impl/file_body_win32.hpp b/include/boost/beast/http/impl/file_body_win32.hpp
--- a/include/boost/beast/http/impl/file_body_win32.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/http/impl/file_body_win32.hpp	2020-05-02 13:50:11.150761798 -0400
@@ -597,7 +597,7 @@
 template<
     class Protocol, class Executor,
     bool isRequest, class Fields,
-    class WriteHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 async_write_some(
     net::basic_stream_socket<
diff -aruN a/include/boost/beast/http/impl/read.hpp b/include/boost/beast/http/impl/read.hpp
--- a/include/boost/beast/http/impl/read.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/http/impl/read.hpp	2020-05-02 13:50:11.150761798 -0400
@@ -304,7 +304,7 @@
     class AsyncReadStream,
     class DynamicBuffer,
     bool isRequest,
-    class ReadHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 async_read_some(
     AsyncReadStream& stream,
@@ -373,7 +373,7 @@
     class AsyncReadStream,
     class DynamicBuffer,
     bool isRequest,
-    class ReadHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 async_read_header(
     AsyncReadStream& stream,
@@ -443,7 +443,7 @@
     class AsyncReadStream,
     class DynamicBuffer,
     bool isRequest,
-    class ReadHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 async_read(
     AsyncReadStream& stream,
@@ -531,7 +531,7 @@
     class AsyncReadStream,
     class DynamicBuffer,
     bool isRequest, class Body, class Allocator,
-    class ReadHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 async_read(
     AsyncReadStream& stream,
diff -aruN a/include/boost/beast/http/impl/write.hpp b/include/boost/beast/http/impl/write.hpp
--- a/include/boost/beast/http/impl/write.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/http/impl/write.hpp	2020-05-02 13:50:11.150761798 -0400
@@ -463,7 +463,7 @@
 template<
     class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-    class WriteHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 async_write_some_impl(
     AsyncWriteStream& stream,
@@ -526,7 +526,7 @@
 template<
     class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-    class WriteHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 async_write_some(
     AsyncWriteStream& stream,
@@ -608,7 +608,7 @@
 template<
     class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-    class WriteHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 async_write_header(
     AsyncWriteStream& stream,
@@ -681,7 +681,7 @@
 template<
     class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-    class WriteHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 async_write(
     AsyncWriteStream& stream,
@@ -801,7 +801,7 @@
 template<
     class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-    class WriteHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 async_write(
     AsyncWriteStream& stream,
@@ -830,7 +830,7 @@
 template<
     class AsyncWriteStream,
     bool isRequest, class Body, class Fields,
-    class WriteHandler>
+    BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 async_write(
     AsyncWriteStream& stream,
diff -aruN a/include/boost/beast/http/span_body.hpp b/include/boost/beast/http/span_body.hpp
--- a/include/boost/beast/http/span_body.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/http/span_body.hpp	2020-05-02 13:50:11.151761808 -0400
@@ -36,8 +36,10 @@
 struct span_body
 {
 private:
-    static_assert(std::is_pod<T>::value,
-        "POD requirements not met");
+    static_assert(
+        std::is_trivial<T>::value &&
+        std::is_standard_layout<T>::value,
+            "POD requirements not met");
 
 public:
     /** The type of container used for the body
diff -aruN a/include/boost/beast/ssl/ssl_stream.hpp b/include/boost/beast/ssl/ssl_stream.hpp
--- a/include/boost/beast/ssl/ssl_stream.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/ssl/ssl_stream.hpp	2020-05-02 13:50:11.151761808 -0400
@@ -555,7 +555,7 @@
         need to ensure that all data is written before the asynchronous operation
         completes.
     */
-    template<class ConstBufferSequence, class WriteHandler>
+    template<class ConstBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
     BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler, void(boost::system::error_code, std::size_t))
     async_write_some(ConstBufferSequence const& buffers,
         BOOST_ASIO_MOVE_ARG(WriteHandler) handler)
@@ -636,7 +636,7 @@
         if you need to ensure that the requested amount of data is read before
         the asynchronous operation completes.
     */
-    template<class MutableBufferSequence, class ReadHandler>
+    template<class MutableBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
     BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler, void(boost::system::error_code, std::size_t))
     async_read_some(MutableBufferSequence const& buffers,
         BOOST_ASIO_MOVE_ARG(ReadHandler) handler)
diff -aruN a/include/boost/beast/version.hpp b/include/boost/beast/version.hpp
--- a/include/boost/beast/version.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/version.hpp	2020-05-02 13:50:11.151761808 -0400
@@ -20,7 +20,7 @@
     This is a simple integer that is incremented by one every
     time a set of code changes is merged to the develop branch.
 */
-#define BOOST_BEAST_VERSION 290
+#define BOOST_BEAST_VERSION 292
 
 #define BOOST_BEAST_VERSION_STRING "Boost.Beast/" BOOST_STRINGIZE(BOOST_BEAST_VERSION)
 
diff -aruN a/include/boost/beast/websocket/impl/accept.hpp b/include/boost/beast/websocket/impl/accept.hpp
--- a/include/boost/beast/websocket/impl/accept.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/websocket/impl/accept.hpp	2020-05-02 13:50:11.153761830 -0400
@@ -542,7 +542,7 @@
 
 template<class NextLayer, bool deflateSupported>
 template<
-    class AcceptHandler>
+    BOOST_BEAST_ASYNC_TPARAM1 AcceptHandler>
 BOOST_BEAST_ASYNC_RESULT1(AcceptHandler)
 stream<NextLayer, deflateSupported>::
 async_accept(
@@ -564,7 +564,7 @@
 template<class NextLayer, bool deflateSupported>
 template<
     class ResponseDecorator,
-    class AcceptHandler>
+    BOOST_BEAST_ASYNC_TPARAM1 AcceptHandler>
 BOOST_BEAST_ASYNC_RESULT1(AcceptHandler)
 stream<NextLayer, deflateSupported>::
 async_accept_ex(
@@ -590,7 +590,7 @@
 template<class NextLayer, bool deflateSupported>
 template<
     class ConstBufferSequence,
-    class AcceptHandler>
+    BOOST_BEAST_ASYNC_TPARAM1 AcceptHandler>
 BOOST_BEAST_ASYNC_RESULT1(AcceptHandler)
 stream<NextLayer, deflateSupported>::
 async_accept(
@@ -621,7 +621,7 @@
 template<
     class ConstBufferSequence,
     class ResponseDecorator,
-    class AcceptHandler>
+    BOOST_BEAST_ASYNC_TPARAM1 AcceptHandler>
 BOOST_BEAST_ASYNC_RESULT1(AcceptHandler)
 stream<NextLayer, deflateSupported>::
 async_accept_ex(
@@ -654,7 +654,7 @@
 template<class NextLayer, bool deflateSupported>
 template<
     class Body, class Allocator,
-    class AcceptHandler>
+    BOOST_BEAST_ASYNC_TPARAM1 AcceptHandler>
 BOOST_BEAST_ASYNC_RESULT1(AcceptHandler)
 stream<NextLayer, deflateSupported>::
 async_accept(
@@ -678,7 +678,7 @@
 template<
     class Body, class Allocator,
     class ResponseDecorator,
-    class AcceptHandler>
+    BOOST_BEAST_ASYNC_TPARAM1 AcceptHandler>
 BOOST_BEAST_ASYNC_RESULT1(AcceptHandler)
 stream<NextLayer, deflateSupported>::
 async_accept_ex(
diff -aruN a/include/boost/beast/websocket/impl/close.hpp b/include/boost/beast/websocket/impl/close.hpp
--- a/include/boost/beast/websocket/impl/close.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/websocket/impl/close.hpp	2020-05-02 13:50:11.153761830 -0400
@@ -382,7 +382,7 @@
 }
 
 template<class NextLayer, bool deflateSupported>
-template<class CloseHandler>
+template<BOOST_BEAST_ASYNC_TPARAM1 CloseHandler>
 BOOST_BEAST_ASYNC_RESULT1(CloseHandler)
 stream<NextLayer, deflateSupported>::
 async_close(close_reason const& cr, CloseHandler&& handler)
diff -aruN a/include/boost/beast/websocket/impl/handshake.hpp b/include/boost/beast/websocket/impl/handshake.hpp
--- a/include/boost/beast/websocket/impl/handshake.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/websocket/impl/handshake.hpp	2020-05-02 13:50:11.153761830 -0400
@@ -268,7 +268,7 @@
 //------------------------------------------------------------------------------
 
 template<class NextLayer, bool deflateSupported>
-template<class HandshakeHandler>
+template<BOOST_BEAST_ASYNC_TPARAM1 HandshakeHandler>
 BOOST_BEAST_ASYNC_RESULT1(HandshakeHandler)
 stream<NextLayer, deflateSupported>::
 async_handshake(
@@ -293,7 +293,7 @@
 }
 
 template<class NextLayer, bool deflateSupported>
-template<class HandshakeHandler>
+template<BOOST_BEAST_ASYNC_TPARAM1 HandshakeHandler>
 BOOST_BEAST_ASYNC_RESULT1(HandshakeHandler)
 stream<NextLayer, deflateSupported>::
 async_handshake(
diff -aruN a/include/boost/beast/websocket/impl/ping.hpp b/include/boost/beast/websocket/impl/ping.hpp
--- a/include/boost/beast/websocket/impl/ping.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/websocket/impl/ping.hpp	2020-05-02 13:50:11.153761830 -0400
@@ -288,7 +288,7 @@
 }
 
 template<class NextLayer, bool deflateSupported>
-template<class WriteHandler>
+template<BOOST_BEAST_ASYNC_TPARAM1 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT1(WriteHandler)
 stream<NextLayer, deflateSupported>::
 async_ping(ping_data const& payload, WriteHandler&& handler)
@@ -306,7 +306,7 @@
 }
 
 template<class NextLayer, bool deflateSupported>
-template<class WriteHandler>
+template<BOOST_BEAST_ASYNC_TPARAM1 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT1(WriteHandler)
 stream<NextLayer, deflateSupported>::
 async_pong(ping_data const& payload, WriteHandler&& handler)
diff -aruN a/include/boost/beast/websocket/impl/read.hpp b/include/boost/beast/websocket/impl/read.hpp
--- a/include/boost/beast/websocket/impl/read.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/websocket/impl/read.hpp	2020-05-02 13:50:11.153761830 -0400
@@ -804,7 +804,7 @@
 }
 
 template<class NextLayer, bool deflateSupported>
-template<class DynamicBuffer, class ReadHandler>
+template<class DynamicBuffer, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 stream<NextLayer, deflateSupported>::
 async_read(DynamicBuffer& buffer, ReadHandler&& handler)
@@ -878,7 +878,7 @@
 }
 
 template<class NextLayer, bool deflateSupported>
-template<class DynamicBuffer, class ReadHandler>
+template<class DynamicBuffer, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 stream<NextLayer, deflateSupported>::
 async_read_some(
@@ -1263,7 +1263,7 @@
 }
 
 template<class NextLayer, bool deflateSupported>
-template<class MutableBufferSequence, class ReadHandler>
+template<class MutableBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
 BOOST_BEAST_ASYNC_RESULT2(ReadHandler)
 stream<NextLayer, deflateSupported>::
 async_read_some(
diff -aruN a/include/boost/beast/websocket/impl/write.hpp b/include/boost/beast/websocket/impl/write.hpp
--- a/include/boost/beast/websocket/impl/write.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/websocket/impl/write.hpp	2020-05-02 13:50:11.153761830 -0400
@@ -700,7 +700,7 @@
 }
 
 template<class NextLayer, bool deflateSupported>
-template<class ConstBufferSequence, class WriteHandler>
+template<class ConstBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 stream<NextLayer, deflateSupported>::
 async_write_some(bool fin,
@@ -756,7 +756,7 @@
 }
 
 template<class NextLayer, bool deflateSupported>
-template<class ConstBufferSequence, class WriteHandler>
+template<class ConstBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
 BOOST_BEAST_ASYNC_RESULT2(WriteHandler)
 stream<NextLayer, deflateSupported>::
 async_write(
diff -aruN a/include/boost/beast/websocket/stream.hpp b/include/boost/beast/websocket/stream.hpp
--- a/include/boost/beast/websocket/stream.hpp	2020-04-22 09:34:50.000000000 -0400
+++ b/include/boost/beast/websocket/stream.hpp	2020-05-02 13:50:11.154761841 -0400
@@ -2634,7 +2634,7 @@
 
     template<
         class ResponseDecorator,
-        class AcceptHandler>
+        BOOST_BEAST_ASYNC_TPARAM1 AcceptHandler>
     BOOST_BEAST_ASYNC_RESULT1(AcceptHandler)
     async_accept_ex(
         ResponseDecorator const& decorator,
@@ -2643,7 +2643,7 @@
     template<
         class ConstBufferSequence,
         class ResponseDecorator,
-        class AcceptHandler>
+            BOOST_BEAST_ASYNC_TPARAM1 AcceptHandler>
     BOOST_BEAST_ASYNC_RESULT1(AcceptHandler)
     async_accept_ex(
         ConstBufferSequence const& buffers,
@@ -2656,7 +2656,7 @@
     template<
         class Body, class Allocator,
         class ResponseDecorator,
-        class AcceptHandler>
+            BOOST_BEAST_ASYNC_TPARAM1 AcceptHandler>
     BOOST_BEAST_ASYNC_RESULT1(AcceptHandler)
     async_accept_ex(
         http::request<Body,
diff -aruN a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md	2020-04-22 09:34:50.000000000 -0400
+++ b/CHANGELOG.md	2020-05-02 13:51:02.388315008 -0400
@@ -1,3 +1,25 @@
+Version 292:
+
+* Fix compile errors on Visual Studio with /std:c++latest
+* Fix standalone compilation error with std::string_view 
+* OpenSSL 1.0.2 or later is required
+* Fix c++20 deprecation warning in span_body
+
+--------------------------------------------------------------------------------
+
+Version 291:
+
+* Test websocket with use_awaitable
+* Test http write with use_awaitable
+* Test http read with use_awaitable
+* Fix use buffered_read_stream with use_awaitable
+* Implement is_completion_token_for trait
+* Test use_awaitable with basic_stream
+* Fix async_detect_ssl with use_awaitable
+* Add clang coroutines-ts to circleci config
+
+--------------------------------------------------------------------------------
+
 Version 290:
 
 * Travis build host now bionic
diff -aruN a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt	2020-04-22 09:34:50.000000000 -0400
+++ b/CMakeLists.txt	2020-05-02 13:51:02.389315019 -0400
@@ -40,7 +40,7 @@
 #
 #-------------------------------------------------------------------------------
 
-project (Beast VERSION 290)
+project (Beast VERSION 292)
 
 set_property (GLOBAL PROPERTY USE_FOLDERS ON)
 option (Beast_BUILD_EXAMPLES "Build examples" ON)
diff -aruN a/doc/qbk/01_intro/_intro.qbk b/doc/qbk/01_intro/_intro.qbk
--- a/doc/qbk/01_intro/_intro.qbk	2020-04-22 09:34:50.000000000 -0400
+++ b/doc/qbk/01_intro/_intro.qbk	2020-05-02 13:51:02.391315040 -0400
@@ -58,7 +58,7 @@
 
 * [*C++11:] Robust support for most language features.
 * [*Boost:] Beast only works with Boost, not stand-alone Asio
-* [*OpenSSL:] Required to build the tests, examples, and to use TLS/Secure sockets.
+* [*OpenSSL:] Version 1.0.2 or higher. Required to build the tests, examples, and to use TLS/Secure sockets.
 
 Tested with these compilers: msvc-14+, gcc 4.8.4+, clang 3.6+.
 
diff -aruN a/test/beast/core/async_base.cpp b/test/beast/core/async_base.cpp
--- a/test/beast/core/async_base.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/core/async_base.cpp	2020-05-02 13:51:02.470315892 -0400
@@ -585,7 +585,7 @@
     //--------------------------------------------------------------------------
 
     // Asynchronously read into a buffer until the buffer is full, or an error occurs
-    template<class AsyncReadStream, class ReadHandler>
+    template<class AsyncReadStream, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
     typename net::async_result<ReadHandler, void(error_code, std::size_t)>::return_type
     async_read(AsyncReadStream& stream, net::mutable_buffer buffer, ReadHandler&& handler)
     {
diff -aruN a/test/beast/core/basic_stream.cpp b/test/beast/core/basic_stream.cpp
--- a/test/beast/core/basic_stream.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/core/basic_stream.cpp	2020-05-02 13:51:02.470315892 -0400
@@ -30,6 +30,13 @@
 #include <array>
 #include <thread>
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/awaitable.hpp>
+#include <boost/asio/co_spawn.hpp>
+#include <boost/asio/use_awaitable.hpp>
+#endif
+
+
 namespace boost {
 namespace beast {
 
@@ -258,7 +265,7 @@
     {
         string_view s_;
         net::ip::tcp::socket socket_;
-        
+
     public:
         session(
             string_view s,
@@ -1297,6 +1304,52 @@
 
     //--------------------------------------------------------------------------
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompilation(
+        basic_stream<net::ip::tcp>& stream,
+        net::mutable_buffer outbuf,
+        net::const_buffer inbuf,
+        net::ip::tcp::resolver::results_type resolve_results)
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+                stream.async_read_some(outbuf, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+                stream.async_write_some(inbuf, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<net::ip::tcp::resolver::results_type::const_iterator>, decltype(
+                stream.async_connect(
+                    resolve_results.begin(),
+                    resolve_results.end(),
+                    net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<net::ip::tcp::endpoint>, decltype(
+            stream.async_connect(
+                resolve_results,
+                net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<void>, decltype(
+            stream.async_connect(
+                resolve_results.begin()->endpoint(),
+                net::use_awaitable))>);
+
+        auto comparison_function = [](error_code&, net::ip::tcp::endpoint) { return true; };
+
+        static_assert(std::is_same_v<
+            net::awaitable<net::ip::tcp::resolver::results_type::const_iterator>, decltype(
+            stream.async_connect(
+                resolve_results.begin(),
+                resolve_results.end(),
+                comparison_function,
+                net::use_awaitable))>);
+    }
+#endif
+
     void
     run()
     {
@@ -1307,6 +1360,11 @@
         testMembers();
         testJavadocs();
         testIssue1589();
+
+#if BOOST_ASIO_HAS_CO_AWAIT
+        // test for compilation success only
+        boost::ignore_unused(&basic_stream_test::testAwaitableCompilation);
+#endif
     }
 };
 
diff -aruN a/test/beast/core/buffered_read_stream.cpp b/test/beast/core/buffered_read_stream.cpp
--- a/test/beast/core/buffered_read_stream.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/core/buffered_read_stream.cpp	2020-05-02 13:51:02.470315892 -0400
@@ -21,6 +21,9 @@
 #include <boost/asio/spawn.hpp>
 #include <boost/asio/strand.hpp>
 #include <boost/optional.hpp>
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
 
 namespace boost {
 namespace beast {
@@ -211,6 +214,22 @@
         }
     };
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(
+        buffered_read_stream<test::stream, flat_buffer>& stream,
+        net::mutable_buffer rxbuf,
+        net::const_buffer txbuf)
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            stream.async_read_some(rxbuf, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            stream.async_write_some(txbuf, net::use_awaitable))>);
+    }
+#endif
+
     void run() override
     {
         testSpecialMembers();
@@ -221,6 +240,10 @@
         });
 
         testAsyncLoop();
+
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&buffered_read_stream_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/core/detect_ssl.cpp b/test/beast/core/detect_ssl.cpp
--- a/test/beast/core/detect_ssl.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/core/detect_ssl.cpp	2020-05-02 13:51:02.470315892 -0400
@@ -16,6 +16,11 @@
 #include <boost/beast/core/flat_buffer.hpp>
 #include <boost/beast/core/string.hpp>
 #include <boost/core/exchange.hpp>
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/awaitable.hpp>
+#include <boost/asio/co_spawn.hpp>
+#include <boost/asio/use_awaitable.hpp>
+#endif
 namespace boost {
 namespace beast {
 
@@ -166,12 +171,25 @@
         }
     }
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(test::stream& stream, flat_buffer& b)
+    {
+        static_assert(
+            std::is_same_v<
+                net::awaitable<bool>, decltype(
+                async_detect_ssl(stream, b, net::use_awaitable))>);
+    }
+#endif
+
     void
     run() override
     {
         testDetect();
         testRead();
         testAsyncRead();
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&detect_ssl_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/core/flat_stream.cpp b/test/beast/core/flat_stream.cpp
--- a/test/beast/core/flat_stream.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/core/flat_stream.cpp	2020-05-02 13:51:02.471315902 -0400
@@ -17,6 +17,9 @@
 #include <boost/beast/core/role.hpp>
 #include <initializer_list>
 #include <vector>
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
 
 namespace boost {
 namespace beast {
@@ -208,11 +211,30 @@
         check({1,2,3,4},    3,    3, true);
     }
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(
+        flat_stream<test::stream>& stream,
+        net::mutable_buffer rxbuf,
+        net::const_buffer txbuf)
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            stream.async_read_some(rxbuf, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            stream.async_write_some(txbuf, net::use_awaitable))>);
+    }
+#endif
+
     void
     run() override
     {
         testMembers();
         testSplit();
+#if BOOST_ASIO_HAS_CO_AWAIT
+    boost::ignore_unused(&flat_stream_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/core/stream_traits.cpp b/test/beast/core/stream_traits.cpp
--- a/test/beast/core/stream_traits.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/core/stream_traits.cpp	2020-05-02 13:51:02.471315902 -0400
@@ -214,14 +214,14 @@
     struct async_read_stream
     {
         net::io_context::executor_type get_executor() noexcept;
-        template<class MutableBufferSequence, class ReadHandler>
+        template<class MutableBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
         void async_read_some(MutableBufferSequence const&, ReadHandler&&);
     };
 
     struct async_write_stream
     {
         net::io_context::executor_type get_executor() noexcept;
-        template<class ConstBufferSequence, class WriteHandler>
+        template<class ConstBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
         void async_write_some(ConstBufferSequence const&, WriteHandler&&);
     };
 
@@ -232,9 +232,9 @@
     struct async_stream : async_read_stream, async_write_stream
     {
         net::io_context::executor_type get_executor() noexcept;
-        template<class MutableBufferSequence, class ReadHandler>
+        template<class MutableBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 ReadHandler>
         void async_read_some(MutableBufferSequence const&, ReadHandler&&);
-        template<class ConstBufferSequence, class WriteHandler>
+        template<class ConstBufferSequence, BOOST_BEAST_ASYNC_TPARAM2 WriteHandler>
         void async_write_some(ConstBufferSequence const&, WriteHandler&&);
     };
 
diff -aruN a/test/beast/http/CMakeLists.txt b/test/beast/http/CMakeLists.txt
--- a/test/beast/http/CMakeLists.txt	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/http/CMakeLists.txt	2020-05-02 13:51:02.472315914 -0400
@@ -26,6 +26,7 @@
     empty_body.cpp
     error.cpp
     field.cpp
+    field_compiles.cpp
     fields.cpp
     file_body.cpp
     message.cpp
diff -aruN a/test/beast/http/field_compiles.cpp b/test/beast/http/field_compiles.cpp
--- a/test/beast/http/field_compiles.cpp	1969-12-31 19:00:00.000000000 -0500
+++ b/test/beast/http/field_compiles.cpp	2020-05-02 13:51:02.473315924 -0400
@@ -0,0 +1,11 @@
+//
+// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// Official repository: https://github.com/boostorg/beast
+//
+
+// Test that header file is self-contained.
+#include <boost/beast/http/field.hpp>
diff -aruN a/test/beast/http/Jamfile b/test/beast/http/Jamfile
--- a/test/beast/http/Jamfile	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/http/Jamfile	2020-05-02 13:51:02.472315914 -0400
@@ -16,6 +16,7 @@
     dynamic_body.cpp
     error.cpp
     field.cpp
+    field_compiles.cpp
     fields.cpp
     file_body.cpp
     message.cpp
diff -aruN a/test/beast/http/read.cpp b/test/beast/http/read.cpp
--- a/test/beast/http/read.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/http/read.cpp	2020-05-02 13:51:02.472315914 -0400
@@ -25,6 +25,9 @@
 #include <boost/asio/strand.hpp>
 #include <boost/asio/ip/tcp.hpp>
 #include <atomic>
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
 
 namespace boost {
 namespace beast {
@@ -529,6 +532,49 @@
         }
     }
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(
+        test::stream& stream,
+        flat_buffer& dynbuf,
+        parser<true, string_body>& request_parser,
+        request<http::string_body>& request,
+        parser<false, string_body>& response_parser,
+        response<http::string_body>& response)
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_read(stream, dynbuf, request, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_read(stream, dynbuf, request_parser, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_read(stream, dynbuf, response, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_read(stream, dynbuf, response_parser, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_read_some(stream, dynbuf, request_parser, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_read_some(stream, dynbuf, response_parser, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_read_header(stream, dynbuf, request_parser, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_read_header(stream, dynbuf, response_parser, net::use_awaitable))>);
+    }
+#endif
+
     void
     run() override
     {
@@ -552,6 +598,9 @@
         testRegression430();
         testReadGrind();
         testAsioHandlerInvoke();
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&read_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/http/write.cpp b/test/beast/http/write.cpp
--- a/test/beast/http/write.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/http/write.cpp	2020-05-02 13:51:02.473315924 -0400
@@ -26,6 +26,9 @@
 #include <boost/asio/strand.hpp>
 #include <sstream>
 #include <string>
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
 
 namespace boost {
 namespace beast {
@@ -994,6 +997,59 @@
         }
     }
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(
+        test::stream& stream,
+        serializer<true, string_body>& request_serializer,
+        request<string_body>& req,
+        request<string_body> const& creq,
+        serializer<false, string_body>& response_serializer,
+        response<string_body>& resp,
+        response<string_body> const& cresp)
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write(stream, request_serializer, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write(stream, response_serializer, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write(stream, req, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write(stream, creq, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write(stream, resp, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write(stream, cresp, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write_some(stream, request_serializer, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write_some(stream, response_serializer, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write_header(stream, request_serializer, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            http::async_write_header(stream, response_serializer, net::use_awaitable))>);
+    }
+#endif
+
+
     void
     run() override
     {
@@ -1017,6 +1073,9 @@
             });
         testAsioHandlerInvoke();
         testBodyWriters();
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&write_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/websocket/accept.cpp b/test/beast/websocket/accept.cpp
--- a/test/beast/websocket/accept.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/websocket/accept.cpp	2020-05-02 13:51:02.473315924 -0400
@@ -14,7 +14,9 @@
 #include <boost/beast/_experimental/test/tcp.hpp>
 #include <boost/beast/_experimental/unit_test/suite.hpp>
 #include "test.hpp"
-
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
 namespace boost {
 namespace beast {
 namespace websocket {
@@ -810,6 +812,27 @@
         }
     }
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(
+        stream<net::ip::tcp::socket>& s,
+        http::request<http::empty_body>& req,
+        net::mutable_buffer buf
+        )
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<void>, decltype(
+            s.async_accept(net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<void>, decltype(
+            s.async_accept(req, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<void>, decltype(
+            s.async_accept(buf, net::use_awaitable))>);
+    }
+#endif
+
     void
     run() override
     {
@@ -820,6 +843,9 @@
         testInvalidInputs();
         testEndOfStream();
         testAsync();
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&accept_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/websocket/close.cpp b/test/beast/websocket/close.cpp
--- a/test/beast/websocket/close.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/websocket/close.cpp	2020-05-02 13:51:02.473315924 -0400
@@ -16,6 +16,9 @@
 
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/strand.hpp>
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
 
 namespace boost {
 namespace beast {
@@ -735,6 +738,15 @@
         }
     };
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(stream<test::stream>& s, close_reason cr )
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<void>, decltype(
+            s.async_close(cr, net::use_awaitable))>);
+    }
+#endif
+
     void
     run() override
     {
@@ -742,6 +754,9 @@
         testTimeout();
         testSuspend();
         testMoveOnly();
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&close_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/websocket/handshake.cpp b/test/beast/websocket/handshake.cpp
--- a/test/beast/websocket/handshake.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/websocket/handshake.cpp	2020-05-02 13:51:02.473315924 -0400
@@ -18,6 +18,9 @@
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/strand.hpp>
 #include <thread>
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
 
 namespace boost {
 namespace beast {
@@ -704,6 +707,23 @@
         }
     }
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(
+        stream<test::stream>& s,
+        std::string host,
+        std::string port,
+        response_type& resp)
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<void>, decltype(
+            s.async_handshake(host, port, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<void>, decltype(
+            s.async_handshake(resp, host, port, net::use_awaitable))>);
+    }
+#endif
+
     void
     run() override
     {
@@ -714,6 +734,9 @@
         testMoveOnly();
         testAsync();
         testIssue1460();
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&handshake_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/websocket/ping.cpp b/test/beast/websocket/ping.cpp
--- a/test/beast/websocket/ping.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/websocket/ping.cpp	2020-05-02 13:51:02.474315935 -0400
@@ -18,6 +18,10 @@
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/strand.hpp>
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
+
 namespace boost {
 namespace beast {
 namespace websocket {
@@ -483,12 +487,30 @@
         }
     };
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(
+        stream<test::stream>& s,
+        ping_data& pdat)
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<void>, decltype(
+            s.async_ping(pdat, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<void>, decltype(
+            s.async_pong(pdat, net::use_awaitable))>);
+    }
+#endif
+
     void
     run() override
     {
         testPing();
         testSuspend();
         testMoveOnly();
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&ping_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/websocket/read2.cpp b/test/beast/websocket/read2.cpp
--- a/test/beast/websocket/read2.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/websocket/read2.cpp	2020-05-02 13:51:02.474315935 -0400
@@ -14,6 +14,10 @@
 
 #include <boost/asio/write.hpp>
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
+
 #include <boost/config/workaround.hpp>
 #if BOOST_WORKAROUND(BOOST_GCC, < 80200)
 #define BOOST_BEAST_SYMBOL_HIDDEN __attribute__ ((visibility("hidden")))
@@ -673,10 +677,34 @@
         }
     }
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(
+        stream<test::stream>& s,
+        flat_buffer& dynbuf,
+        net::mutable_buffer buf,
+        std::size_t limit)
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            s.async_read(dynbuf, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            s.async_read_some(buf, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            s.async_read_some(dynbuf, limit, net::use_awaitable))>);
+    }
+#endif
+
     void
     run() override
     {
         testRead();
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&read2_test::testAwaitableCompiles);
+#endif
     }
 };
 
diff -aruN a/test/beast/websocket/write.cpp b/test/beast/websocket/write.cpp
--- a/test/beast/websocket/write.cpp	2020-04-22 09:34:50.000000000 -0400
+++ b/test/beast/websocket/write.cpp	2020-05-02 13:51:02.474315935 -0400
@@ -13,6 +13,10 @@
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/strand.hpp>
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/asio/use_awaitable.hpp>
+#endif
+
 #include "test.hpp"
 
 namespace boost {
@@ -716,6 +720,22 @@
         BEAST_EXPECT(n1 < n0 + s.size());
     }
 
+#if BOOST_ASIO_HAS_CO_AWAIT
+    void testAwaitableCompiles(
+        stream<test::stream>& s,
+        net::mutable_buffer buf,
+        bool fin)
+    {
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            s.async_write(buf, net::use_awaitable))>);
+
+        static_assert(std::is_same_v<
+            net::awaitable<std::size_t>, decltype(
+            s.async_write_some(fin, buf, net::use_awaitable))>);
+    }
+#endif
+
     void
     run() override
     {
@@ -726,6 +746,9 @@
         testMoveOnly();
         testIssue300();
         testIssue1666();
+#if BOOST_ASIO_HAS_CO_AWAIT
+        boost::ignore_unused(&write_test::testAwaitableCompiles);
+#endif
     }
 };