topic Re: preemptive authentication CL_HTTP_CLIENT in Application Development and Automation Discussions

preemptive authentication CL_HTTP_CLIENT

ADO — Tue, 22 Jun 2021 05:51:30 GMT

Hello

I have implemented a program to call a REST API. Inside the program I use the classes CL_HTTP_CLIENT to manage the connection. There is no SOAP connection or WebService. It's a direct call from ABAP.
During my tests I get an error like "403 Auth failed: No Authorization header"

The provider of the REST API told me to change preemptive authentication.

My problem is that I do not know how to change this.

Any idea?

Thanks

Re: preemptive authentication CL_HTTP_CLIENT

ec1 — Thu, 29 Jul 2021 23:04:42 GMT

Hi Arnfried,

You need to set the authentication data by either calling authenticate method or set the data in SM59 destination

https://help.sap.com/erp_hcm_ias2_2014_03/helpdata/en/b2/86b4512ea4414fb36f17b0568a86ac/content.htm?no_cache=true

Stev

Re: preemptive authentication CL_HTTP_CLIENT

former_member1299559 — Fri, 30 Jul 2021 19:09:01 GMT

Hello Arnfried,

I had the same problem, SM59 did solve it, it was not possible to set the preemptive parameter in the authenticate method, I had to create an SM59-entry (you can send the path for your request with

CL_HTTP_UTILITY=>SET_REQUEST_URI).

A nice weekend to you

Sibylle

Re: preemptive authentication CL_HTTP_CLIENT

thalesvb — Mon, 30 Aug 2021 19:04:01 GMT

Hi, I think I have a similar problem to this question, but my SM59 the Preemptive parameter does not exists (probably an old SAP_BASIS release).

Would be possible for you attach a screenshot on your answer showing that parameter in configuration screen and also your SAP_BASIS version? I want to confirm that I haven't missing it onscreen, but it would also help anyone to identify if their system version has it or not.

Thanks