On 15/05/21 5:13 pm, Jaikiran Pai wrote:
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"?
A quick check of the curl source code[1] suggests that it does indeed do
special handling of this TE request param[2]. It seems to do a
case-insensitive check[3] of the user passed value for "TE" header and
if it finds that it's "trailers" (case-insensitive) then it just
overwrites that header value with the literal "trailers" before issuing
the request. I guess Firefox has something similar.
[1] https://github.com/curl/curl
[2]
https://github.com/curl/curl/blob/455a63c66f188598275e87d32de2c4e8e26b80cb/lib/http2.c#L1851
[3]
https://github.com/curl/curl/blob/455a63c66f188598275e87d32de2c4e8e26b80cb/lib/http2.c#L1830
-Jaikiran
