Jenkins doesn't display test results: Bad Message 431 - reason: Request Header Fields Too Large

[Klumbumbus]

It happens not always but for some days/weeks very often. Instead of the test result it just says
Bad Message 431 - reason: Request Header Fields Too Large

• https://josm.openstreetmap.de/jenkins/job/JOSM-Integration/4179/testReport/
• https://josm.openstreetmap.de/jenkins/job/JOSM-Integration/4179/jdk=JDK8/testReport/org.openstreetmap.josm.gui.preferences.map/MapPaintPreferenceTestIT/testStyleValidity_PPWBC_Rendering__standarized_symbols____https___github_com_OpenSeaMap_josm_blob_master_PPWBC_MapCSS_mapcss_/

[Don-vip]

I frequently restart Jenkins to update plugins, maybe this is just that? I never faced the error message you cite, and I check them very often. The links you give work fine for me.

[Klumbumbus]

Thats how it looks for me in Firefox: BadMessage431.png​, however I just tested another browser and there it works fine.

[Don-vip]

For me it works fine in Firefox, see 18595.JPG​. But I can see the error in Jenkins logs:

2020-01-21 20:58:48.169+0000 [id=255]   WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 20:58:56.337+0000 [id=78]    WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 20:59:00.941+0000 [id=320]   WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 20:59:02.178+0000 [id=11]    WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 20:59:04.658+0000 [id=255]   WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 20:59:04.731+0000 [id=78]    WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 20:59:05.464+0000 [id=320]   WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 20:59:05.564+0000 [id=255]   WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 21:00:31.503+0000 [id=78]    WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 21:01:37.025+0000 [id=11]    WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 21:07:04.794+0000 [id=11]    WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 21:07:07.176+0000 [id=444]   WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192
2020-01-21 21:07:55.138+0000 [id=316]   WARNING o.eclipse.jetty.http.HttpParser#parseFields: Header is too large 8193>8192

[Klumbumbus]

I cleared cockies and it works again. See ​https://issues.jenkins-ci.org/browse/JENKINS-45449