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Tuesday, 4 January 2011

How to POST to REST WCF web services with Fiddler

After making a set of REST web services with WCF I tested them by making requests with a browser. This is fine for GET requests however you will need some HTTP building tool such as Fiddler to test a POST, PUT or DELETE REST web service.

To begin with I have a WCF REST web service that intends for a Comment object to be POSTed:
[WebInvoke(UriTemplate = "comment", Method = "POST",
  RequestFormat = WebMessageFormat.Xml, ResponseFormat = WebMessageFormat.Xml)]
public Comment Comment(Comment comment)
{
    return comment;
}

The definition of Comment is simple:
[DataContract(Namespace = "")]
public class Comment
{
    [DataMember]
    public string Body { get; set; }
}

Note this namespace is very important as it will need to be specified in the XML sent in the request. Personally I set my DataContract with no namespace to save having to write it out in the XML every time.

Now open up Fiddler and lets get testing:

Create a POST to your REST service in Fiddler

  1. Go to the Request Builder tab in Fiddler.
  2. Set the verb to POST
  3. Set the URL to the one of your service
  4. Type "Content-Type: application/xml" into the Request Headers. (This is the bit that got be stumped for hours)
  5. Add your XML to the Request Body like <Comment><Body>colin</Body></Comment>

If you did give your DataContract a namespace other than blank as I did you will need to specify it in the XML of your Request Body. Such as: <Comment xmlns="MyNameSpace"><Body>colin</Body></Comment>

Happy testing!

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Posted by Colin Farr at Tuesday, January 04, 2011 Labels: , ,

71 comments:

  1. Adnan Taj25 January 2011 at 09:21

    Thanks I did it . It works great

    ReplyDelete
  2. Anonymous16 August 2011 at 17:56

    www.oniontest.org (EASY/SIMPLE) rest/http web service testing without mocking yourself to an imaginary world ! - Write an Onion !

    ReplyDelete
  3. WebDev20 October 2011 at 16:56

    That's a great way to test our services, really. I was struggling with all the work it takes to mock up my services until I found your post. Thank you so much!

    ReplyDelete
  4. pantestmb25 October 2011 at 18:13

    Even If you have blank namespace you have to put
    xmlns="" in the request body ...

    http://pantestmb.blogspot.com/2011/10/pass-multiple-body-parameters-wcf-rest.html

    Whithout xmlns="" in the request body , problems can appear

    ReplyDelete
  5. Colin Farr26 October 2011 at 08:52

    Thanks for the tip but I'll be honest, I have never found any problems myself nor have the iPhone developers that consumed this API.

    What problems were you experiencing exactly? Just for my benefit in case I have missed something.

    ReplyDelete
  6. Anonymous9 April 2012 at 09:50

    Hello, Thanks for the great tutorial. I tried to extend the class with inserting DateTime? variable in it as following:-

    [DataContract(Namespace = "")]
    public class Comment
    {
    [DataMember]
    public string BodyComment { get; set; }
    [DataMember]
    public DateTime? CreatedDate { get; set; }
    }

    And followed everything else as you mentioned in the tutorial.
    But when I'm sending a POST request like this:
    xyz, or
    xyz
    As I want CreatedDate to be empty, it is giving me "Http 400 Bad request error".

    Kindly suggest if I'm doing something wrong.

    ReplyDelete
    Replies
    1. Anonymous9 April 2012 at 09:54

      Sorry POST didn't come, but it is like
      I'm sending xyz in body and empty CreatedDate...

      Delete
    2. Colin Farr10 April 2012 at 11:02

      Bit hard to debug this kind of thing remotely. Where is the exception being thrown and what is it when you are debugging?

      Delete
  7. Anonymous9 May 2012 at 03:38

    Thank you so much. I have been trying to understand the WebInvoke attribute for a few days and your example made it clear.

    ReplyDelete
  8. Anonymous15 October 2012 at 21:08

    Thank you so much, this is exactly what I was looking for.

    ReplyDelete
  9. Dave25 October 2012 at 11:43

    Fantastic post, been knocking myself out working out why object was not posting correctly, the namespace did it.

    ReplyDelete
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