Question

I am sending HTTP GET request and receiving data here:

ssize_t numBytes = recvfrom(sock, request, 1000, 0,
                   (struct sockaddr *) &myaddr, &fromAddrLen);
    if(numBytes < 0)
        printf("The requested resource does not exist.\n");
    else
        printf("the webpage exist :)\n");

I want to check whether the requested page exist or not. But even if a page does not exist, status message is often sent from server (something like “404 not found”).
It is still some data, thus I cannot get numBytes<0.

How can I check the status of response to be able to verify the existence of the page?

Answer 1

Well you have to read the first line of the response and extract the status code. If it’s a 4xx or 5xx code something went wrong (404 = Not Found, 403 = Access Denied).