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richardaburton at hotmail dot com ¶
21 years ago
Improved HTTP/1.1 chunked transfer-encoding example.



The sample code given below by Jack does not function correctly when run against a recent version of Apache (I'm assuming that this did once work, but from the HTTP/1.1 spec I can only assume if it did work it was based mostly on luck).



<?php



$header = "";

$response = "";



// connect

if (!($request=fsockopen('example.com',80,$errno,$errstr))) exit($errstr);

else {

   socket_set_timeout($request,10);

   // send request

   fwrite($request,$post);

   // get header

   do $header.=fread($request,1); while (!preg_match('/\\r\\n\\r\\n$/',$header));

   // check for chunked encoding

   if (preg_match('/Transfer\\-Encoding:\\s+chunked\\r\\n/',$header))

      do {

         $byte = "";

         $chunk_size="";

         do {

            $chunk_size.=$byte;

            $byte=fread($request,1);

         } while ($byte!="\\r");      // till we match the CR

         fread($request, 1);         // also drop off the LF

         $chunk_size=hexdec($chunk_size); // convert to real number

         $response.=fread($request,$chunk_size);

         fread($request,2);          // ditch the CRLF that trails the chunk

      } while ($chunk_size);         // till we reach the 0 length chunk (end marker)

   else {

      // check for specified content length

      if (preg_match('/Content\\-Length:\\s+([0-9]*)\\r\\n/',$header,$matches)) {

         $response=fread($request,$matches[1]);

      } else {

         // not a nice way to do it (may also result in extra CRLF which trails the real content???)

         while (!feof($request)) $response .= fread($request, 4096);

      }

   }

   // close connection

   fclose($request);

}



// do something useful with the response

print($header);

print($response);



?>



Richard.
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