libevent http server

libevent_http_server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <event2/event.h>
#include <event2/http.h>
#include <event2/buffer.h>
#include <event2/util.h>

#define SERVER_PORT 8080

void generic_request_handler(struct evhttp_request *req, void *arg) {
    struct evbuffer *evb = evbuffer_new();
    if (!evb) {
        fprintf(stderr, "Failed to create evbuffer!\n");
        evhttp_send_error(req, HTTP_INTERNAL, "Server Error");
        return;
    }

    const char *response_body = "<h1>Hello, libevent HTTP Server!</h1>\n"
                                "<p>You requested the path: ";
    
    evbuffer_add_printf(evb, "%s", response_body);
    
    const char *uri = evhttp_request_get_uri(req);
    evbuffer_add_printf(evb, "%s</p>", uri ? uri : "/");

    evhttp_add_header(evhttp_request_get_output_headers(req), 
                      "Content-Type", "text/html");

    evhttp_send_reply(req, HTTP_OK, "OK", evb);

    evbuffer_free(evb);

    printf("Request handled for URI: %s\n", uri ? uri : "/");
}


int main(int argc, char **argv) {
    struct event_base *base = NULL;
    struct evhttp *http = NULL;
    struct evhttp_bound_socket *handle = NULL;

    base = event_base_new();
    if (!base) {
        fprintf(stderr, "Could not initialize libevent base!\n");
        return 1;
    }

    http = evhttp_new(base);
    if (!http) {
        fprintf(stderr, "Could not create evhttp object!\n");
        event_base_free(base);
        return 1;
    }

    evhttp_set_gencb(http, generic_request_handler, NULL);

    handle = evhttp_bind_socket_with_handle(http, "0.0.0.0", SERVER_PORT);
    if (!handle) {
        fprintf(stderr, "Could not bind to port %d. Maybe it's already in use?\n", SERVER_PORT);
        evhttp_free(http);
        event_base_free(base);
        return 1;
    }

    printf("Starting libevent HTTP server on http://127.0.0.1:%d\n", SERVER_PORT);
    printf("Press Ctrl+C to stop.\n");

    event_base_dispatch(base);

    evhttp_free(http);
    event_base_free(base);

    printf("Server stopped.\n");
    return 0;
}