On 08/06/2026 09:09, Harri Pesonen via users wrote:
Thanks,
org.apache.coyote.http11.Http11InputBuffer#fill
is logging the URL and headers of every (succesful) request when I set .level =
ALL on logging.properties (but this is not practical in production).
Why did you do that? That wasn't what I suggested you did.
Hopefully it logs also when there is error.
It will log every request so you'll see the error as well.
It would be nice to be able to log only those requests that result in 400 Bad
Request for any reason,
when Tomcat rejects the HTTP request so that it does not go to application at
all.
Log level should be SEVERE (ERROR) or WARNING in these cases, so that normal
log level does not need to be changed.
By default, we aim not to have bad user input trigger any logging at
all. If you follow my previous advice, you should get the information
you need (at INFO level).
Mark
________________________________
Lähettäjä: Mark Thomas <[email protected]>
Lähetetty: perjantai 5. kesäkuuta 2026 18.22
Vastaanottaja: [email protected] <[email protected]>
Aihe: Re: Log headers for failing request
On 05/06/2026 13:56, Harri Pesonen via users wrote:
How to log HTTP headers for POST request that fails with 400 Bad Request so
that the request does not go to application at all?
It can be seen in access log only.
I would like to see the headers or the full request.
I suspect that client sends content-type somehow incorrectly.
There is nothing in catalina log.
Tomcat version?
HTTP version?
Try adding
-Dorg.apache.juli.logging.UserDataHelper.CONFIG=INFO_ALL
to JAVA_OPTS.
Mark
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