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73 lines
3.0 KiB
C
73 lines
3.0 KiB
C
// Copyright (c) 2021 Cesanta Software Limited
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// All rights reserved
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//
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// Example HTTP client. Connect to `s_url`, send request, wait for a response,
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// print the response and exit.
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// You can change `s_url` from the command line by executing: ./example YOUR_URL
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//
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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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static const char *s_post_data = NULL; // POST data
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static const uint64_t s_timeout_ms = 1500; // Connect timeout in milliseconds
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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_OPEN) {
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// Connection created. Store connect expiration time in c->data
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*(uint64_t *) c->data = mg_millis() + s_timeout_ms;
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} else if (ev == MG_EV_POLL) {
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if (mg_millis() > *(uint64_t *) c->data &&
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(c->is_connecting || c->is_resolving)) {
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mg_error(c, "Connect timeout");
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}
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} else 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 = mg_url_host(s_url)};
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mg_tls_init(c, &opts);
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}
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// Send request
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int content_length = s_post_data ? strlen(s_post_data) : 0;
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mg_printf(c,
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"%s %s HTTP/1.0\r\n"
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"Host: %.*s\r\n"
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"Content-Type: octet-stream\r\n"
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"Content-Length: %d\r\n"
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"\r\n",
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s_post_data ? "POST" : "GET", mg_url_uri(s_url), (int) host.len,
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host.ptr, content_length);
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mg_send(c, s_post_data, content_length);
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} else if (ev == MG_EV_HTTP_MSG) {
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// Response is received. Print it
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struct mg_http_message *hm = (struct mg_http_message *) ev_data;
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printf("%.*s", (int) hm->message.len, hm->message.ptr);
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c->is_draining = 1; // Tell mongoose to close this connection
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*(bool *) c->fn_data = true; // 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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}
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int main(int argc, char *argv[]) {
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const char *log_level = getenv("LOG_LEVEL"); // Allow user to set log level
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if (log_level == NULL) log_level = "4"; // Default is verbose
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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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if (argc > 1) s_url = argv[1]; // Use URL provided in the command line
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mg_log_set(atoi(log_level)); // Set to 0 to disable debug
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mg_mgr_init(&mgr); // Initialise event manager
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mg_http_connect(&mgr, s_url, fn, &done); // Create client connection
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while (!done) mg_mgr_poll(&mgr, 50); // Event manager loops until 'done'
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mg_mgr_free(&mgr); // Free resources
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return 0;
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}
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