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71 lines
2.6 KiB
C
71 lines
2.6 KiB
C
// Copyright (c) 2021 Cesanta Software Limited
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// All rights reserved
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//
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// Example streaming HTTP client.
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// The default HTTP handler waits until the whole HTTP message is buffered in
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// c->recv IO buffer. It can be large. This example shows how to receive
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// a potentially large response in chunks by handling the MG_EV_READ events.
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//
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// You can change `s_url` from the command line by executing: ./example YOUR_URL
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// To enable SSL/TLS, see https://mongoose.ws/tutorials/tls/#how-to-build
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#include "mongoose.h"
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// The very first web page in history. You can replace it from command line
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static const char *s_url = "http://info.cern.ch";
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// Print HTTP response and signal that we're done
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static void fn(struct mg_connection *c, int ev, void *ev_data) {
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if (ev == MG_EV_CONNECT) {
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// Connected to server. Extract host name from URL
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struct mg_str host = mg_url_host(s_url);
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if (mg_url_is_ssl(s_url)) {
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struct mg_tls_opts opts = {.ca = mg_unpacked("/certs/ca.pem"),
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.name = host};
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mg_tls_init(c, &opts);
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}
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// Send request
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mg_printf(c,
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"GET %s HTTP/1.1\r\n"
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"Connection: close\r\n"
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"Host: %.*s\r\n"
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"\r\n",
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mg_url_uri(s_url), (int) host.len, host.buf);
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} else if (ev == MG_EV_READ) {
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// c->data[0] holds a flag, whether we have parsed the request already
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if (c->data[0] == 0) {
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struct mg_http_message hm;
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int n = mg_http_parse((char *) c->recv.buf, c->recv.len, &hm);
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if (n < 0) mg_error(c, "Bad response");
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if (n > 0) {
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fwrite(c->recv.buf + n, 1, c->recv.len - n, stdout); // Print body
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c->recv.len = 0; // Cleanup receive buffer
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c->data[0] = 1; // Request parsed, set the flag
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}
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} else {
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fwrite(c->recv.buf, 1, c->recv.len, stdout);
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c->recv.len = 0; // Cleanup the receive buffer
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}
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} else if (ev == MG_EV_CLOSE) {
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*(bool *) c->fn_data = true; // Done, tell event loop to stop
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} else if (ev == MG_EV_ERROR) {
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*(bool *) c->fn_data = true; // Error, Tell event loop to stop
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}
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(void) ev_data;
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}
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int main(int argc, char *argv[]) {
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struct mg_mgr mgr; // Event manager
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bool done = false; // Event handler flips it to true
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mg_mgr_init(&mgr); // Initialise event manager
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mg_log_set(MG_LL_INFO); // Set to 0 to disable debug log
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if (argc > 1) s_url = argv[1]; // Use URL from command line
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mg_connect(&mgr, s_url, fn, &done); // Create client connection
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while (!done) mg_mgr_poll(&mgr, 1000); // Infinite event loop
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mg_mgr_free(&mgr); // Free resources
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return 0;
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}
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