Gatling doesn't read response body from some servers

Gatling (Open-Source)
1

Hi.

I use quite ordinary scenario:

.exec(http(“request”)
.post("/")
.body(StringBody("${request}"))
.check(status.is(session => 200))
.check(bodyString.saveAs(“Http_Response”))
)

On some servers gatling reads full response, but on some the
bodyString is empty(0 length). The requests are the same
and I tried with curl both servers and got responses from
every server. What could be the reason for this kind of behavior.

Thanks in advance
Ivar Suisalu

2

It means the requests are not the same. Try spotting differences, in particular in HTTP headers.

3

Hi.

The requests are read from csv feeder and headers are defined in the beginning of the scenario:

val httpProtocol = http
.disableCaching
.baseUrl(configSource.getString(“simulation.serverUrl”)) // Here is the root for all relative URLs
.header(“Content-Type”, “application/xml”)
.header(“Expect”, “100-continue”)
.acceptHeader("/")

So I think the requests are the same.

Ivar

4

I debugged gatling and noticed that in problematic case
the first response headers were:

Transfer-Encoding → chunked
Vary → Accept-Encoding
{AsciiString@5844} “content-encoding” → gzip

so the response is chunked and gzipped.
Response from successful server wasn’t chunked.
So it has something to do with processing chunked
response.

Ivar

5

Please provide a way to reproduce your issue.

6

Hi.

It is hard to provide testcase. I constructed with nginx and perl one mocking server, but this worked correctly.
What I noticed during debugging with problematic server, that gatling does link prefetch and after that
server responds Content-Length: 0 and this ends the conversation.