73 lines
3.0 KiB
C
73 lines
3.0 KiB
C
|
// Copyright (c) 2021 Cesanta Software Limited
|
||
|
|
// All rights reserved
|
||
|
|
//
|
||
|
|
// Example HTTP client. Connect to `s_url`, send request, wait for a response,
|
||
|
|
// print the response and exit.
|
||
|
|
// You can change `s_url` from the command line by executing: ./example YOUR_URL
|
||
|
|
//
|
||
|
|
// To enable SSL/TLS, , see https://mongoose.ws/tutorials/tls/#how-to-build
|
||
|
|
|
||
|
|
#include "mongoose.h"
|
||
|
|
|
||
|
|
// The very first web page in history. You can replace it from command line
|
||
|
|
static const char *s_url = "http://info.cern.ch/";
|
||
|
|
static const char *s_post_data = NULL; // POST data
|
||
|
|
static const uint64_t s_timeout_ms = 1500; // Connect timeout in milliseconds
|
||
|
|
|
||
|
|
// Print HTTP response and signal that we're done
|
||
|
|
static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
|
||
|
|
if (ev == MG_EV_OPEN) {
|
||
|
|
// Connection created. Store connect expiration time in c->data
|
||
|
|
*(uint64_t *) c->data = mg_millis() + s_timeout_ms;
|
||
|
|
} else if (ev == MG_EV_POLL) {
|
||
|
|
if (mg_millis() > *(uint64_t *) c->data &&
|
||
|
|
(c->is_connecting || c->is_resolving)) {
|
||
|
|
mg_error(c, "Connect timeout");
|
||
|
|
}
|
||
|
|
} else if (ev == MG_EV_CONNECT) {
|
||
|
|
// Connected to server. Extract host name from URL
|
||
|
|
struct mg_str host = mg_url_host(s_url);
|
||
|
|
|
||
|
|
// If s_url is https://, tell client connection to use TLS
|
||
|
|
if (mg_url_is_ssl(s_url)) {
|
||
|
|
struct mg_tls_opts opts = {.ca = "ca.pem", .srvname = host};
|
||
|
|
mg_tls_init(c, &opts);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Send request
|
||
|
|
int content_length = s_post_data ? strlen(s_post_data) : 0;
|
||
|
|
mg_printf(c,
|
||
|
|
"%s %s HTTP/1.0\r\n"
|
||
|
|
"Host: %.*s\r\n"
|
||
|
|
"Content-Type: octet-stream\r\n"
|
||
|
|
"Content-Length: %d\r\n"
|
||
|
|
"\r\n",
|
||
|
|
s_post_data ? "POST" : "GET", mg_url_uri(s_url), (int) host.len,
|
||
|
|
host.ptr, content_length);
|
||
|
|
mg_send(c, s_post_data, content_length);
|
||
|
|
} else if (ev == MG_EV_HTTP_MSG) {
|
||
|
|
// Response is received. Print it
|
||
|
|
struct mg_http_message *hm = (struct mg_http_message *) ev_data;
|
||
|
|
printf("%.*s", (int) hm->message.len, hm->message.ptr);
|
||
|
|
c->is_closing = 1; // Tell mongoose to close this connection
|
||
|
|
*(bool *) fn_data = true; // Tell event loop to stop
|
||
|
|
} else if (ev == MG_EV_ERROR) {
|
||
|
|
*(bool *) fn_data = true; // Error, tell event loop to stop
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char *argv[]) {
|
||
|
|
const char *log_level = getenv("LOG_LEVEL"); // Allow user to set log level
|
||
|
|
if (log_level == NULL) log_level = "4"; // Default is verbose
|
||
|
|
|
||
|
|
struct mg_mgr mgr; // Event manager
|
||
|
|
bool done = false; // Event handler flips it to true
|
||
|
|
if (argc > 1) s_url = argv[1]; // Use URL provided in the command line
|
||
|
|
mg_log_set(atoi(log_level)); // Set to 0 to disable debug
|
||
|
|
mg_mgr_init(&mgr); // Initialise event manager
|
||
|
|
mg_http_connect(&mgr, s_url, fn, &done); // Create client connection
|
||
|
|
while (!done) mg_mgr_poll(&mgr, 50); // Event manager loops until 'done'
|
||
|
|
mg_mgr_free(&mgr); // Free resources
|
||
|
|
return 0;
|
||
|
|
}
|