CODEWITHSUNDEEP
csocketshttphttp-headers
Mazy999
Mazy999

Reputation: 31

How to remove this HEADER HTTP?

I made a socket in C. This program is operated by command line and compiled on Linux. It does the following:

My question is:

How to remove this HEADER before the file is recorded by the fwrite () function. like a byte to byte code, to find a double line "\ n \ n".

Upvotes: 1

Views: 3710

Answers (1)

Arite
Arite

Reputation: 529

An HTTP header always ends in \r\n\r\n. Therefore you just want to find the first string match of that, and increment the position by 4 bytes.

strstr() function

The strstr() function (found in string.h) does just this:

char * strstr(const char *str1, const char *str2);

Where str2 is the string you're searching for in str1.

It returns the memory location to the beginning of the first match. If the string is not found it returns NULL.

Example

So, if you assume the buffer is larger than the header:

char *buf = getHTTPResponse(url); // Get HTTP response from URL
char *content = strstr(buf, "\r\n\r\n");
if (content != NULL) {
    content += 4; // Offset by 4 bytes to start of content
}
else {
    content = buf; // Didn't find end of header, write out everything
}

// Write out content to file

See here for a complete HTTP client example in C that uses strstr().

Upvotes: 6

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