CODEWITHSUNDEEP
htmlcsocketshttptcp
Freelancer
Freelancer

Reputation: 844

How to send html files with http protocol over tcp in c language?

I 'm writing a HTTP web server that can respond to PUT, GET , ... requests when GET request is sent from a browser , the browser should receives the related HTML file I have analyzed the GET request in the Wireshark it sends the whole HTML file of the website and then the browser requests the rest of the files that are used in the HTML file

My problem is that when I use the send() function and send and HTTP respond to the GET requests the body part of the HTTP message that contains the HTML file is not displayed correctly in the browser when it is read from a HTML file but when I type the HTML file into a string variable and give it to the send() function it works.

here is my code:

char send_buffer[1000];
FILE *sendFile = fopen("foo.txt", "r");
while( !feof(sendFile) )
{
int numread = fread(send_buffer, sizeof(unsigned char), 1000, sendFile);
if( numread < 1 ) break; // EOF or error

char *send_buffer_ptr = send_buffer;
do
{
    int numsent = send(connected, send_buffer_ptr, numread, 0);
    if( numsent < 1 ) // 0 if disconnected, otherwise error
    {
        if( numsent < 0 )
        {
            if( WSAGetLastError() == WSAEWOULDBLOCK )
            {
                fd_set wfd;
                FD_ZERO(&wfd);
                FD_SET(connected, &wfd);

                timeval tm;
                tm.tv_sec = 10;
                tm.tv_usec = 0;

                if( select(0, NULL, &wfd, NULL, &tm) > 0 )
                    continue;
            }
        }

        break; // timeout or error
    }

    send_buffer_ptr += numsent;
    numread -= numsent;
}
while( numread > 0 );
}

I have tested the code with the foo file containing the HTTP header and some HTML code as below:

HTTP/1.1 200 OK
Content-length: 60
Content-Type: text/html


<!DOCTYPE html>
<html>
<body>

<h1>My First Heading</h1>

<p>My first paragraph.</p>

</body>
</html>

I have also tries sending the header with a separate send function and the HTML file with another send function right after it.

Upvotes: 2

Views: 8381

Answers (1)

user149341
user149341

Reputation:

The Content-Length header in your response is incorrect. The body of your response is over 100 bytes long, not 60 bytes like the header says. (If your file uses CR+LF line endings, it's actually even longer.)

In general, the Content-Length header should be generated by the web server, as it must exactly match the size of the response body. Storing it in the response is far too prone to errors.

Upvotes: 1

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