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    copied!<p>I found two mistakes in my code, the first it was authenticating against Google plus while I should authenticate against Blogger.</p> <pre><code>&lt;?php $url = "https://accounts.google.com/o/oauth2/auth"; $params = array( "response_type" =&gt; "code", "client_id" =&gt; "XXXXXXXXXX.apps.googleusercontent.com", "redirect_uri" =&gt; "http://localhost/phpBlogger/oauth2callback.php", "scope" =&gt; "https://www.googleapis.com/auth/blogger"); // Request Blogger authentication $request_to = $url.'?'.http_build_query($params); header("Location: ".$request_to); ?&gt; if(isset($_GET['code'])) { // Get an access token $code = $_GET['code']; $url = 'https://accounts.google.com/o/oauth2/token'; $apikey = 'XXXXXXXXXXXXXXXXXXXXXXXXX'; $blogId = 'XXXXXXXXXXXXXXXXXXXXXXXXX'; $params = array( "code" =&gt; $code, "client_id" =&gt; urlencode("XXXXXXXXXXXXXXXXXXXXXXXXX.apps.googleusercontent.com"), "client_secret" =&gt; urlencode("XXXXXXXXXXXXXXXXXXXXXXXXX"), "redirect_uri" =&gt; urlencode("http://localhost/phpBlogger/oauth2callback.php"), "grant_type" =&gt; urlencode("authorization_code") ); // HTTP query builder foreach($params as $key=&gt;$value) { $fields .= $key.'='.$value.'&amp;'; } rtrim($fields, '&amp;'); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, $fields); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE); $data = curl_exec($ch); curl_close($ch); //echo curl_errno($ch); $response = json_decode($data); $accessToken = $response-&gt;access_token; } </code></pre> <p>The second error was how I did construct the JSON POST query, I should add the Content-length to the header:</p> <pre><code> $postTitle = 'post test'; $postContent = 'just another test.'; $url = 'https://www.googleapis.com/blogger/v3/blogs/'.$blogId.'/posts/'; $body = ' { "kind": "blogger#post", "blog": {"id": "'.$blogId.'"}, "title": "'.$postTitle.'", "content": "'.$postContent.'" }'; $headerQuery = array(); $headerQuery[] = 'Authorization: OAuth '.$accessToken; $headerQuery[] = 'Content-Length: '.strlen($body); $headerQuery[] = 'Content-Type: application/json'; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HTTPHEADER, $headerQuery); curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, $body); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE); curl_setopt($ch, CURLINFO_HEADER_OUT, TRUE); $data = curl_exec($ch); /*var_dump(curl_getinfo($ch,CURLINFO_HEADER_OUT)); echo "&lt;br&gt;&lt;br&gt;&lt;br&gt;".$data;*/ //echo curl_errno($ch); $response = json_decode($data); echo "url: " . $response-&gt;url."&lt;br /&gt;"; echo "id: " . $response-&gt;id."&lt;br /&gt;"; curl_close($ch); </code></pre>
 

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