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POCurl will not post multiple data to server
 

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    <p>I am writing an application for work that needs to perform HTTP requests to a server, and get a response, in JSON back.</p> <p>At the moment, my code connects to the server, and gets a response back, which is great. However, I also need to send data to the server, which will process it, and send me the jSON.</p> <p>My problem is that I am able to send, thanks to POSTFIELDS, only a single "field", and won't get any response if I insert more that one.</p> <p>The code is the following:</p> <pre><code>// writefunc works, so there is no point adding its code in here size_t Simulator::writefunc(void *ptr, size_t size, size_t nmemb, struct string *buffer_in); void Simulator::move(Player *player) { std::ostringstream ss_url; ss_url &lt;&lt; API_URL &lt;&lt; "functionCalled"; char const *url = ss_url.str().c_str(); std::ostringstream ss_postfields; // This will not work - And all values do NOT contain any space // The server do NOT receive any data (in POST and GET) ss_postfields &lt;&lt; "user_name=" &lt;&lt; player-&gt;getName() &lt;&lt; "&amp;user_secret=" &lt;&lt; player-&gt;secret() &lt;&lt; "&amp;app_id=" &lt;&lt; player-&gt;getApp_id() &lt;&lt; "&amp;lat=" &lt;&lt; player-&gt;getLocation()-&gt;getLat() &lt;&lt;"&amp;lon=" &lt;&lt; player-&gt;getLocation()-&gt;getLon(); // This will not work either // ss_postfields &lt;&lt; "user_name=nicolas&amp;app_id=2"; // This works and will send the data to the server, which will receive and process it. // ss_postfields &lt;&lt; "user_name=" &lt;&lt; player-&gt;getName(); const char *postfields = ss_postfields.str().c_str(); CURL *curl_handle; curl_global_init(CURL_GLOBAL_ALL); curl_handle = curl_easy_init(); if(curl_handle){ struct string s; init_string(&amp;s); curl_easy_setopt(curl_handle, CURLOPT_URL, url); curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, writefunc); curl_easy_setopt(curl_handle, CURLOPT_NOPROGRESS, 1L); curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, &amp;s); curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDS, postfields); curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDSIZE, strlen(postfields)); curl_easy_setopt(curl_handle, CURLOPT_POST, 1L); CURLcode res = curl_easy_perform(curl_handle); if(CURLE_OK != res) { printf("Error: %s\n", strerror(res)); exit(0); } printf("%s\n", s.ptr); curl_easy_cleanup(curl_handle); curl_global_cleanup(); } } </code></pre> <p>I thought I would also give the output of CURLOPT_HEADER and CURLOPT_VERBOSE for when I send only 1 value, or multiple values:</p> <p>When I Send One value only:</p> <pre><code>* About to connect() to localhost port 8888 (#0) * Trying ::1... * connected * Connected to localhost (::1) port 8888 (#0) &gt; POST [api_url] HTTP/1.1 Host: localhost:8888 Accept: */* Content-Length: 22 Content-Type: application/x-www-form-urlencoded * upload completely sent off: 22 out of 22 bytes &lt; HTTP/1.1 200 OK &lt; Date: Sun, 24 Nov 2013 17:25:14 GMT &lt; Server: Apache &lt; X-Powered-By: PHP/5.3.20 &lt; Cache-Control: no-cache &lt; X-Debug-Token: a41727 &lt; Transfer-Encoding: chunked &lt; Content-Type: application/json &lt; * Connection #0 to host localhost left intact 0 HTTP/1.1 200 OK Date: Sun, 24 Nov 2013 17:25:14 GMT Server: Apache X-Powered-By: PHP/5.3.20 Cache-Control: no-cache X-Debug-Token: a41727 Transfer-Encoding: chunked Content-Type: application/json [ OUTPUT FROM SERVER HERE ] * Closing connection #0 </code></pre> <p>And when I send multiple values:</p> <pre><code>* About to connect() to localhost port 8888 (#0) * Trying ::1... * connected * Connected to localhost (::1) port 8888 (#0) &gt; POST [api_url] HTTP/1.1 Host: localhost:8888 Accept: */* Content-Length: 1 Content-Type: application/x-www-form-urlencoded * upload completely sent off: 1 out of 1 bytes &lt; HTTP/1.1 200 OK &lt; Date: Sun, 24 Nov 2013 17:30:13 GMT &lt; Server: Apache &lt; X-Powered-By: PHP/5.3.20 &lt; Cache-Control: no-cache &lt; X-Debug-Token: d1947e &lt; Transfer-Encoding: chunked &lt; Content-Type: application/json &lt; * Connection #0 to host localhost left intact 0 HTTP/1.1 200 OK Date: Sun, 24 Nov 2013 17:30:13 GMT Server: Apache X-Powered-By: PHP/5.3.20 Cache-Control: no-cache X-Debug-Token: d1947e Transfer-Encoding: chunked Content-Type: application/json [ OUTPUT FROM SERVER HERE ] * Closing connection #0 </code></pre>
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