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3648295 - Error message "illegal transfer-encoding: chunked must be applied only once" in SAP Web Dispatcher

Symptom

A non-SAP system was configured as a backend system behind an SAP Web Dispatcher (i.e., using the "EXTSRV" option of the "wdisp/system_X" parameter).

While communicating with such non-SAP system through the SAP Web Dispatcher, the following error message is logged by the SAP Web Dispatcher in its trace file (dev_webdisp):

[Thr ...] *** ERROR => illegal transfer-encoding: chunked must be applied only once [http_parse_util.c 261] 

Capturing the issue with the SAP Web Dispatcher running on trace level 2 reveals what is wrong with the header's value.

In the example below, "chunked" is defined twice, which is incorrect:

[Thr ...] HTTP response (raw) [.../.../...]:
[Thr ...]   HTTP/1.1 200 
[Thr ...]   date: [date and time of the response]
[Thr ...]   transfer-encoding: chunked, chunked


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Environment

  • SAP Web Dispatcher

Product

SAP Web Dispatcher all versions

Keywords

transfer-encoding, chunked , KBA , BC-CST-WDP , Web Dispatcher , Problem

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