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40 lines
2.0 KiB
Markdown
40 lines
2.0 KiB
Markdown
---
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title: HTTP events
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---
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As discussed in the overview, `mg_set_protocol_http_websocket()` function
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parses incoming data, treats it as HTTP or WebSocket, and triggers high-level
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HTTP or WebSocket events. Here is a list of events specific to HTTP.
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- MG_EV_HTTP_REQUEST: An HTTP request has arrived. Parsed request
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is passed as
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`struct http_message` through the handler's `void *ev_data` pointer.
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- MG_EV_HTTP_REPLY: An HTTP reply has arrived. Parsed reply is
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passed as `struct http_message` through the handler's `void *ev_data`
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pointer.
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- MG_EV_HTTP_MULTIPART_REQUEST: A multipart POST request has arrived.
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This event is sent before body is parsed. After this, the user
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should expect a sequence of MG_EV_HTTP_PART_BEGIN/DATA/END requests.
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This is also the last time when headers and other request fields are
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accessible.
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- MG_EV_HTTP_CHUNK: An HTTP chunked-encoding chunk has arrived.
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The parsed HTTP reply is passed as `struct http_message` through the
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handler's `void *ev_data` pointer. `http_message::body` would contain
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incomplete, reassembled HTTP body.
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It will grow with every new chunk that arrives, and it can
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potentially consume a lot of memory. The event handler may process
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the body as chunks are coming, and signal Mongoose to delete processed
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body by setting `MG_F_DELETE_CHUNK` in `mg_connection::flags`. When
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the last zero chunk is received,
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Mongoose sends `MG_EV_HTTP_REPLY` event with
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full reassembled body (if handler did not signal to delete chunks) or
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with empty body (if handler did signal to delete chunks).
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- MG_EV_HTTP_PART_BEGIN: a new part of multipart message is started,
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extra parameters are passed in mg_http_multipart_part
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- MG_EV_HTTP_PART_DATA: a new portion of data from the multiparted message
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no additional headers are available, only data and data size
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- MG_EV_HTTP_PART_END: a final boundary received, analogue to maybe used to
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find the end of packet
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Note: Mongoose should be compiled with MG_ENABLE_HTTP_STREAMING_MULTIPART
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to enable multipart events.
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