diff --git a/support/startup/PhabricatorStartup.php b/support/startup/PhabricatorStartup.php
--- a/support/startup/PhabricatorStartup.php
+++ b/support/startup/PhabricatorStartup.php
@@ -142,8 +142,6 @@
 
     self::verifyRewriteRules();
 
-    self::detectPostMaxSizeTriggered();
-
     self::beginOutputCapture();
   }
 
@@ -583,104 +581,6 @@
   }
 
 
-  /**
-   * Detect if this request has had its POST data stripped by exceeding the
-   * 'post_max_size' PHP configuration limit.
-   *
-   * PHP has a setting called 'post_max_size'. If a POST request arrives with
-   * a body larger than the limit, PHP doesn't generate $_POST but processes
-   * the request anyway, and provides no formal way to detect that this
-   * happened.
-   *
-   * We can still read the entire body out of `php://input`. However according
-   * to the documentation the stream isn't available for "multipart/form-data"
-   * (on nginx + php-fpm it appears that it is available, though, at least) so
-   * any attempt to generate $_POST would be fragile.
-   *
-   * @task validation
-   */
-  private static function detectPostMaxSizeTriggered() {
-    // If this wasn't a POST, we're fine.
-    if ($_SERVER['REQUEST_METHOD'] != 'POST') {
-      return;
-    }
-
-    // If "enable_post_data_reading" is off, we won't have $_POST and this
-    // condition is effectively impossible.
-    if (!ini_get('enable_post_data_reading')) {
-      return;
-    }
-
-    // If there's POST data, clearly we're in good shape.
-    if ($_POST) {
-      return;
-    }
-
-    // For HTML5 drag-and-drop file uploads, Safari submits the data as
-    // "application/x-www-form-urlencoded". For most files this generates
-    // something in POST because most files decode to some nonempty (albeit
-    // meaningless) value. However, some files (particularly small images)
-    // don't decode to anything. If we know this is a drag-and-drop upload,
-    // we can skip this check.
-    if (isset($_REQUEST['__upload__'])) {
-      return;
-    }
-
-    // PHP generates $_POST only for two content types. This routing happens
-    // in `main/php_content_types.c` in PHP. Normally, all forms use one of
-    // these content types, but some requests may not -- for example, Firefox
-    // submits files sent over HTML5 XMLHTTPRequest APIs with the Content-Type
-    // of the file itself. If we don't have a recognized content type, we
-    // don't need $_POST.
-    //
-    // NOTE: We use strncmp() because the actual content type may be something
-    // like "multipart/form-data; boundary=...".
-    //
-    // NOTE: Chrome sometimes omits this header, see some discussion in T1762
-    // and http://code.google.com/p/chromium/issues/detail?id=6800
-    $content_type = isset($_SERVER['CONTENT_TYPE'])
-      ? $_SERVER['CONTENT_TYPE']
-      : '';
-
-    $parsed_types = array(
-      'application/x-www-form-urlencoded',
-      'multipart/form-data',
-    );
-
-    $is_parsed_type = false;
-    foreach ($parsed_types as $parsed_type) {
-      if (strncmp($content_type, $parsed_type, strlen($parsed_type)) === 0) {
-        $is_parsed_type = true;
-        break;
-      }
-    }
-
-    if (!$is_parsed_type) {
-      return;
-    }
-
-    // Check for 'Content-Length'. If there's no data, we don't expect $_POST
-    // to exist.
-    $length = (int)$_SERVER['CONTENT_LENGTH'];
-    if (!$length) {
-      return;
-    }
-
-    // Time to fatal: we know this was a POST with data that should have been
-    // populated into $_POST, but it wasn't.
-
-    $config = ini_get('post_max_size');
-    self::didFatal(
-      "As received by the server, this request had a nonzero content length ".
-      "but no POST data.\n\n".
-      "Normally, this indicates that it exceeds the 'post_max_size' setting ".
-      "in the PHP configuration on the server. Increase the 'post_max_size' ".
-      "setting or reduce the size of the request.\n\n".
-      "Request size according to 'Content-Length' was '{$length}', ".
-      "'post_max_size' is set to '{$config}'.");
-  }
-
-
 /* -(  Rate Limiting  )------------------------------------------------------ */