Hello Krzysztof,
On 15/05/21 1:07 am, Krzysztof K. wrote:
Hi,
I have an issue using http client communicating with servers that most
probably are on GCP (I see header: "via: 1.1 google").
I get "java.io.IOException: Received RST_STREAM: Protocol error".
...
But I'm on JDK 16 (build 16+35-2229) and I get this error when
connecting to a website when I use the header "TE: Trailers" (needs
first letter capitalized).
When I remove this header everything works, if I switch to HTTP 1.1
(with that header) it also works.
Here is a minimal reproducible example:
HttpClient.newBuilder()
.build()
.send(
HttpRequest.newBuilder()
.header("TE", "Trailers")
IMO, this is more of an application issue than the JDK. In HTTP/2 the TE
header[1] is expected to only have the value "trailers" (case sensitive)
as noted here[2]. If you change your code to use "trailers" instead of
"Trailers" it works (as you seem to have noticed). As for why it works
in Firefox or curl, I'm not sure - perhaps they have special handling of
this specific header to lower case its value if it's "Trailers"?
[1] https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/TE
[2] https://datatracker.ietf.org/doc/html/rfc7540#section-8.1.2.2
-Jaikiran
