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I am using SystemTestingTools Version 2.0.32. I am using the AppendHttpCallStub to set up my stub for the endpoint that I'm writing tests for. I am aware that when I feed in a URI into the said method, I need to escape the curly brackets by doubling them up. Not escaping them will cause an exception to be thrown in the method SetEndpoint as String.Format will throw a FormatException error. However, escaping before calling AppendHttpCallStub does not suffice. Later when the stubbed endpoint is called. The GetEndpoint method is invoked, and since the the previous String.Format call in SetEndpoint removes the escaped characters, the String.Format in this method is thrown.

Any advise on how to get around this is deeply appreciated!

var baseUrl= @"http://localhost:23068/";
var endpointUrl= @"{{ ""key"": ""value"" }}";
var stubUrl = $"{baseUrl}{endpointUrl}";
client.AppendHttpCallStub(HttpMethod.Get, new Uri(stubUrl), response);

I am using SystemTestingTools Version 1.3.6 . I used the recorder function to capture a 204 responce (as suggested in the project README). Then I intended to use this captured response as stub for component tests. This is what the response looks like:

METADATA
...

REQUEST
...

--!?@Divider: Any text BEFORE this line = comments, AFTER = response in Fiddler like format

HTTP/1.1 204 NoContent
Server:Microsoft-IIS/10.0
X-Powered-By:ASP.NET
Date:Tue, 05 May 2020 03:41:23 GMT

There is no response body (as expected). I am using ResponseFactory.FromFiddlerLikeResponseFile("/path/to/stubfile")

I get the following exception:
System.ArgumentException : File is not in the right format, please consult https://github.com/AlanCS/SystemTestingTools/

Modifying the captured response and using null as response content is my workaround for now.