#include <stdio.h>
#include <string.h>

int main ()
{
  char *str ="HTTP/1.0 200 OK\n"
              "Date: Thu, 26 Apr 2012 20:57:31 GMT\n"
              "Server: Apache/2.2.16 (Debian)\n"
              "X-Powered-By: PHP/5.3.3-7+squeeze4ex1\n"
              "Vary: Accept-Encoding\n"
              "Content-Length: 88\n"
              "Connection: close\n"
              "Content-Type: text/html\n"
              "\n"
              "success\n";

  // 1. search for success:
  char *content = strstr(<stuff goes here>);
  // 2. Check for success vs fail
  if (content != NULL){
    // Content is now a string pointer with your content
  }
  else {
    // was a failure. :(
  }
  return 0;
}