only return HTTP 400 on client errors

errors fetching the URL should not result in a 400 response

controllers/Parse.php

@@ -108,7 +108,7 @@ class Parse {
       }
 
       if($result['error']) {
-        return $this->respond($response, 400, [
+        return $this->respond($response, 200, [
           'error' => $result['error'],
           'error_description' => $result['error_description']
         ]);
@@ -127,7 +127,7 @@ class Parse {
     @$doc->loadHTML(self::toHtmlEntities($result['body']));
 
     if(!$doc) {
-      return $this->respond($response, 400, [
+      return $this->respond($response, 200, [
         'error' => 'invalid_content',
         'error_description' => 'The document could not be parsed as HTML'
       ]);
@@ -150,7 +150,7 @@ class Parse {
       }
 
       if(!$found) {
-        return $this->respond($response, 400, [
+        return $this->respond($response, 200, [
           'error' => 'no_link_found',
           'error_description' => 'The source document does not have a link to the target URL'
         ]);

tests/ParseTest.php

@@ -44,7 +44,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $response = $this->parse(['url' => $url, 'target' => 'http://example.net']);
 
     $body = $response->getContent();
-    $this->assertEquals(400, $response->getStatusCode());
+    $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
     $this->assertObjectHasAttribute('error', $data);
     $this->assertEquals('no_link_found', $data->error);