Question

Undefined Error in REST API TEST call

1

Dear Mendix-Experts, I seem to be unable to make a POST call to a REST API work in Mendix. I tested the call as such using Postman, where I do get the expected response and no error. However, in Mendix I get an error (see log below) Can you spot the error on my API call? Thanks in advance, this is driving me crazy Jonas Postman: Mendix API call (started via Call Microflow Button)

asked 2019-09-09

Jonas Hohlweck

5 answers

Mohammed Siddiqui · Answer 1 · 2019-09-09

Hi Jonas,

This is because you are having two curly brackets in the request body of REST call. Can you remove one curly bracket and try again?

Edit: Sorry your issue is not double braces, double braces are fine as mentioned in this post.

The issue is the API requires custom HTTP header. You need to add a custom HTTP header where key= Content-Type and value = ‘text/plain’. See the screenshot below and this should solve your issue.

Hope this helps!

Jonas Hohlweck · Answer 2 · 2019-09-09

The double bracket works in another case (pls. see below) and I read the double bracket is required to tell mendix that the following text is not a variable.

Jonas Hohlweck · Answer 3 · 2019-09-09

That’s the error I get when using one opening bracket only:

Robert Price · Answer 4 · 2019-09-09

It looks like the template in Call REST has two opening brackets, when it only needs one.

I would just put {1} in the template, and instead set the JSON body as the parameter value.

Ronald Catersels · Answer 5 · 2019-09-09

I do see a double {{ at the start of the template. Could that be it?

Regards,

Ronald