Answered question

For a legacy SOAP webservice we have to send requests and receive responses using deflate content-encoding.

Example request headers used in the request:
SOAPAction: "getData"
Accept-Encoding: deflate
Content-Encoding: deflate
Content-Type: text/xml; charset=utf-8

Unfortunately, requests with deflate content-encoding generate a response code 500:
HTTP/1.1 500 Internal Server Error
Server: Apache-Coyote/1.1
Content-Length: 0
Date: Fri, 24 Apr 2015 13:35:07 GMT
Connection: close

We tested this request with NeoLoad 5, SoapUI 5.x and SoapUI 4.x and discovered that only SoapUI 4.x managed to successfully send the request and receive a response.

Is deflated encoding supported in NeoLoad 5? If yes, what may be the cause of this error? SoapUI 4.x seems to handle the exact request just fine.