Unable to set Content-Length in the POST request using CVP Rest_Client

[pk88]

Hello Folks,

I am using CVP Rest_Client call studio element to initiate a POST request. In the request it is mandatory to set the Content-Length as 0 (zero). I am trying to set this value in Headers part of the element, but for some reason i still get the below error. Any idea on how to set the content-length? Thanks in advance.

Rest_Client_01,custom,Response_Code,411

Rest_Client_01,custom,API_Response,{"fault":{"faultstring":"Content-Length is missing""detail":{"errorcode":"messaging.adaptors.http.flow.LengthRequired"}}

Thanks

PK

[Gerry O'Rourke]

PK,

I would check what the actually HTTP headers are been set as by using wirshark and sending the HTTP POST it  a Web server using HTTP  (and not HTTPS) - so you can SEE what the headers are set to.

(Its not going to work - sending it to a random HTTP server - but you will see the POST request).

My guess is that the Content-Length header is been set automatically by the REST client element itself and so setting it manually as a header might not work, i.e. not able to override a "default" header.

You might need to create a custom Rest element to do it?

(If you have access to the HTTPS web server - you are sending it to - you might also be able to see the raw request data)

Regards,

Gerry

[pk88]

Hello Gerry,

Thanks for replying. I have verified the HTTPS web server, I don't see the Content-Length header being sent. 

[pk88]

Is there a way to see the complete request which is being sent from CVP app? Any help would be appreciated. Thanks.

[david.macias]

You could log what you're sending, but the actual HTTP request would need to be captured via Wireshark.

david

[david.macias]

After reading this more closely and in your screen shot you're setting a parameter which is what is included in the URL https://host/endpoin?parameter=2. But you talk about setting the header of content length, which I don't believe is possible even with a custom element. Actually I don't see why this needs to be zero as that seems to violate what that header means. The content length is the length of the request. I believe by default it's like 16 bytes. So I think you need to clarify with the API endpoint what they actually want.

david

[pk88 · Accepted solution]

Hello David,

Thanks for the reply. I tried all the combinations in Postman, i used to get the exact same error when i wasn't setting the Content-Length as '0' as i wasn't sending anything in the body. Unfortunately we can't set content-length explicitly in the standard element for the post request. So i decided to insert a dummy body, with that i was able to workaround my problem.

[david.macias]

Glad to hear you solved the problem, can you tell me more about what you mean about a dummy body?

david

[pk88 · Accepted solution]

If you look at the screenshot i have shared in my first post, the body content is empty. With that the API was expecting content-length=0 parameter. So i added below content in the body so that i can get rid of sending content length 0. With that my issue got resolved.

{

"Dummy":"Dummy"

}

[david.macias]

Thanks for explaining the solution.

david