title: how to submit recaptcha using post data
body: <p>I can't figure out what url to post data to for google recpatcha.</p>
  
  <p>for example I can go to my website <a href="http://www.winfreebitcoin.co/login.php" rel="nofollow">http://www.winfreebitcoin.co/login.php</a>
  and then I can get the public key which is 6LcujwETAAAAAFVu4q6R8F0dfQEroEpeP2YIWViS</p>
  
  <p>and then go to</p>
  
  <pre><code>http://www.google.com/recaptcha/api/challenge?k=6LcujwETAAAAAFVu4q6R8F0dfQEroEpeP2YIWViS
  </code></pre>
  
  <p>to get the challenge</p>
  
  <p>I then can go to something like this to get the image</p>
  
  <pre><code>http://www.google.com/recaptcha/api/image?c=03AHJ_VuvRj66zfLX3gox2JRbzpnhXheEo7PeAXLjbG07ezT-GPRWT9jj6lihszM6odlUIB7Bkd60unQAJII61Fau9tMfLR0A290U1e2_o1oU-e1qgm15uyHMS4YBt8vonrUn2qLqBAvcpyUS1lb83tvwW8O6x_iaXTEPRTdzgCGcBP5_EHHNvvmjeVpT1Q5_2xLyJaNg6sJwnouwW43G5m_zr_7nw2b9Vrhya16TPbR2kEBCb1OnjVPbDvJB33ddZQsdo1Pm9EnHS
  </code></pre>
  
  <p>my question is after I get the image, how can I send the data back to the page so that the captcha is redeemed?</p>
  
  <p>I know your supposed to post the field 
  recaptcha_challenge_field    and
  recaptcha_response_field</p>
  
  <p>but I don't know where to post it to</p>
  
  <p>I have tried the site the captcha form is on</p>
  
  <pre><code>http://www.winfreebitcoin.co/login.php
  </code></pre>
  
  <p>the main site</p>
  
  <pre><code>http://www.winfreebitcoin.co/
  </code></pre>
  
  <p>and the google captcha public key</p>
  
  <pre><code>http://www.google.com/recaptcha/api/challenge?k=6LcujwETAAAAAFVu4q6R8F0dfQEroEpeP2YIWViS
  </code></pre>
  
  <p>and none of these seem to work</p>
  
  <p>here is the url with the posted data, so maybe I am doing this wrong?</p>
  
  <pre><code>http://www.google.com/recaptcha/api/challenge?k=6LcujwETAAAAAFVu4q6R8F0dfQEroEpeP2YIWViS&amp;recaptcha_challenge_field=03AHJ_Vusq-MxDZ3y5S8VSMeFxXp_Dmw5zq1T39PCin3I9d5pXYWVCaGh0uURBJ3szrzeN_C1kbBT4WSeCl3dlP4v9r5-rNb7bzUDgBvzViYEnH3_5p6pCSn7jY1lqO1DR_45GcIAm67dDmBqSdeDtvkPY2ESvMMcmDDIgCQ5Pr_HnGOqgi_XZYm88fCUUCQY2EEbBdEok74CG5DGg_iNjb2Md09bAYab8wOtQLPPWi6SfNAPTcuDrR4iXVWnJs1bJSOtDqQceW0-R&amp;recaptcha_response_field=trlynac
  </code></pre>
  
  <p>can anyone show me how to submit the google captcha and what the url is to post the data to?</p>
  
  <p>Thanks</p>
  
  <p><strong>UPDATE</strong>
  I am mainly going to use this for collecting bitcoin from sites, so I really cant use a php script, my bot is in vb.net</p>