I am trying to make a httpcallout to "https://www.carrierlookup.com". When I tried it with browser's apex rest client extension it returned correct response :


but when I tried using apex code and debug response using res.getBody(),it showed html response:

<table border="0" cellpadding="4" cellspacing="0">
<td Response='Array'></td><td>Array</td></tr>

I have used below code for callout :

HttpRequest req = new HttpRequest();
req.setEndpoint(endUrl );
req.setHeader('Content-Type', 'text/plain');

Http http = new Http();

HttpResponse res = http.send(req);

Can anyone suggest why it is showing this type of response and How can I get the correct result ?

  • 2
    whats your end point ?looks like headers are wrongly set Dec 5, 2013 at 2:58

2 Answers 2


Your request's Accept header is probably going out with the value of */* indicating that you can accept any type of response.

This Content-Type header tells the remote endpoint that you're sending them a json request body - it does not indicate anything about the expected response body.

req.setHeader('Content-Type', 'application/json');

Try specifying that the only type of acceptable response is an application/json response.

req.setHeader('Accept', 'application/json');

Relevant W3.org docs: HTTP/1.1: Header Field Definitions


Try changing the Content Type Header to

req.setHeader('Content-Type', 'application/json');


So I signed up to their service to see if I could figure it out...although it's no documented anywhere, try adding .json to the end of the endpoint. When I do that, it works for me...


  • I have already tried with that but still I am getting html response. Can you please help ?
    – S.Sharma
    Dec 5, 2013 at 17:34
  • I am trying the other api for lookup. I tried your solution for that but still no success. When I set ('Accept', 'application/json') into the header, it worked. Anyways, thanks for your response.
    – S.Sharma
    Dec 6, 2013 at 0:12

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