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POMissing chunk size in chunked HTTP response using libcurl
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  1. POMissing chunk size in chunked HTTP response using libcurl
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    copied!<p>I tried to use curl library to build a HTTP proxy. The problem I faced now is chunked HTTP response is not correct. By checking the file saved HTTP response, I found that the chunk size at begining and end of HTTP response is missing. The HTTP response got from curl callback function as show below. </p> <pre><code>size_t httpClient::write_data(char *ptr, size_t size, size_t nmemb, void* userdata) { // get total size size_t realsize = size*nmemb; // get object struct MemoryStruct* mem = (struct MemoryStruct*)userdata; // size of memory block pointerd by the mem-&gt;memory is changed to the new bytes mem-&gt;memory = (char*)realloc(mem-&gt;memory, (mem-&gt;size + realsize)); if(mem-&gt;memory == NULL) { printf("not enough memory (realloc returned NULL)\n"); exit(1); } // copy to memory structure memcpy(&amp;(mem-&gt;memory[mem-&gt;size]), ptr, realsize); mem-&gt;size += realsize; //mem-&gt;memory[mem-&gt;size] = 0; cout&lt;&lt;"Write ["&lt;&lt;realsize&lt;&lt;"] bytes Data to chunk"&lt;&lt;endl; return realsize; } </code></pre> <p>Hope someone can point out the mistake I made for this callback function. Thanks :D</p> <p>The expected chunked HTTP response is shown below:</p> <pre><code>HTTP/1.1 200 OK^M Date: Wed, 17 Oct 2012 07:44:54 GMT^M Expires: -1^M Cache-Control: private, max-age=0^M Content-Type: text/html; charset=UTF-8^M Set-Cookie: PREF=ID=58da9f2271ea2d2b:FF=0:TM=1350459894:LM=1350459894:S=EnJS1hQo2d6_AnPM; expires=Fri, 17-Oct-2014 07:44:54 GMT; path=/; domain=.google.com^M Set-Cookie: NID=65=RW0txpQSNA4NwlRhp0y1I6iF3L0xfugw8Bv4GMsB1yE1qu7iGoBO_2ZxqS0-DSeS4tJKnV26JlfVZmsnjxnjdUaHTDj3-AFREsvyMiE8wSKyabwYG8x-e18Pj8smdxUs; expires=Thu, 18-Apr-2013 07:44:54 GMT; path=/; domain=.google.com; HttpOnly^M P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&amp;answer=151657 for more info."^M Content-Encoding: gzip^M Transfer-Encoding: chunked^M Server: gws^M X-XSS-Protection: 1; mode=block^M X-Frame-Options: SAMEORIGIN^M ^M 907a^M </code></pre> <p>The number 907a in hex format is the chunk size missed in my HTTP response file. </p>
 

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