C - Mongoose Library Reply message - c

Question

i have a problem with my code, but it's right! But i would that when i insert an address wrong: for example http://127.0.0.1:27017/this_is_a_try my server reply me with a message "this is a try" and not with "error 404 not found". Is it so difficult? Thanks everyone help me.
#include <signal.h>
#include <stdlib.h>
#include "mongoose.h"
static int s_received_signal = 0;
static struct mg_server *s_server = NULL;
static const char *s_remote_addr = "glosbe.com:80";
static void signal_handler(int sig_num) {
signal(sig_num, signal_handler);
s_received_signal = sig_num;
}
static int ev_handler(struct mg_connection *conn, enum mg_event ev) {
struct mg_connection *client, *orig;
switch (ev) {
case MG_AUTH:
return MG_TRUE;
case MG_CONNECT:
// Send request to the remote host.
// TODO(lsm): handle connect error here.
mg_printf(conn, "GET %s HTTP/1.0\r\nHost: %s\r\n\r\n",
"/gapi/translate?from=eng&dest=fra&format=json&phrase=cat",
s_remote_addr);
return MG_TRUE;
case MG_REPLY:
// Send reply to the original connection
orig = (struct mg_connection *) conn->connection_param;
mg_send_header(orig, "Content-Type", "text/plain");
mg_send_data(orig, conn->content, conn->content_len);
mg_send_data(orig, "", 0); // Last chunk: mark the end of reply
// Disconnect connections
orig->connection_param = NULL;
conn->connection_param = NULL;
return MG_TRUE;
case MG_REQUEST:
if ((client = mg_connect(s_server, s_remote_addr)) != NULL) {
// Interconnect requests
client->connection_param = conn;
conn->connection_param = client;
return MG_MORE;
} else {
mg_printf_data(conn, "%s", "cannot send API request");
return MG_TRUE;
}
default:
return MG_FALSE;
}
}
int main(void) {
s_server = mg_create_server(NULL, ev_handler);
mg_set_option(s_server, "listening_port", "27017");
// Setup signal handlers
signal(SIGTERM, signal_handler);
signal(SIGINT, signal_handler);
printf("Listening on port %s\n", mg_get_option(s_server, "listening_port"));
while (s_received_signal == 0) {
mg_poll_server(s_server, 1000);
}
mg_destroy_server(&s_server);
printf("Existing on signal %d\n", s_received_signal);
return EXIT_SUCCESS;
}

Answer 1

Your codes seems very close to mongoose http_client.c sample.
Anyway reading mongoose code, it appears that the http answer code fills uri field.
In mongoose.c parse_http_message process HTTP request and answer with the following code :
ri->request_method = skip(&buf, " ");
ri->uri = skip(&buf, " ");
ri->http_version = skip(&buf, "\r\n");
Then it give the oportunity using :
mg_send_status(orig, atoi(conn->uri)); // uri contains status response
Then the answer code will becomes something like :
case MG_REPLY:
orig = (struct mg_connection *) conn->connection_param;
mg_send_status(orig, atoi(conn->uri)); // uri contains status of the http response
mg_send_header(orig, "Content-Type", "text/plain");
mg_send_data(orig, conn->content, conn->content_len);
mg_send_data(orig, "", 0); // Last chunk: mark the end of reply
orig->connection_param = NULL;
conn->connection_param = NULL;
return MG_TRUE;
EDIT
Since this commit it is possible to access to http client answer code in a more explicit way:
mg_send_status(orig, conn->status_code);