Cannot upload gpx track with DirectUpload plugin (JOSM behind HTTP proxy with authentication)

[toorboalex]

What steps will reproduce the problem?

1. I use HTTP proxy with authentication. JOSM working through proxy correctly.
2. When uploading gpx track with DirectUpload plugin I recieve an authentication error.

What is the expected result?

Upload gpx track to OSM server.

What happens instead?

Error reported: Передача на сервер не удалась. Сервер вернул следующее сообщение: Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy filter is denied. )

Please provide any additional information below. Attach a screenshot if possible.

Revision: 8339
Repository Root: http://josm.openstreetmap.de/svn
Relative URL: ^/trunk
Last Changed Author: stoecker
Last Changed Date: 2015-05-07 17:30:43 +0200 (Thu, 07 May 2015)
Build-Date: 2015-05-08 01:31:23
URL: http://josm.openstreetmap.de/svn/trunk
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last Changed Rev: 8339

Identification: JOSM/1.5 (8339 ru) Windows 7 64-Bit
Memory Usage: 232 MB / 494 MB (40 MB allocated, but free)
Java version: 1.8.0_45, Oracle Corporation, Java HotSpot(TM) Client VM
VM arguments: [-Djava.net.useSystemProxies=true, -Djava.security.manager, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp, -Djnlpx.vmargs=LURqYXZhLnV0aWwuQXJyYXlzLnVzZUxlZ2FjeU1lcmdlU29ydD10cnVlAC1Eam5scC5hcHBsaWNhdGlvbi5ocmVmPWh0dHBzOi8vam9zbS5vcGVuc3RyZWV0bWFwLmRlL2Rvd25sb2FkL2pvc20uam5scAAtWG14NTEyTQAtRGphdmEubmV0LnVzZVN5c3RlbVByb3hpZXM9dHJ1ZQA=, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.splashport=64834, -Djnlpx.home=<java.home>\bin, -Djnlpx.remove=false, -Djnlpx.offline=false, -Djnlpx.relaunch=true, -Djnlpx.session.data=C:\Temp\session8511883022408392721, -Djnlpx.heapsize=NULL,NULL, -Djava.security.policy=file:C:\Program Files (x86)\Java\jre1.8.0_45\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.origFilenameArg=C:\Users\gulenov_ai\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\56\1ee8cfb8-693b5037]

Plugins:
- DirectDownload (30892)
- DirectUpload (30892)
- HouseNumberTaggingTool (30892)
- OpeningHoursEditor (30962)
- PicLayer (31114)
- editgpx (30892)
- gpxfilter (30892)
- imagery_offset_db (31056)
- namemanager (30892)
- public_transport (31114)
- reltoolbox (31056)
- reverter (31120)
- turnrestrictions (31034)
- utilsplugin2 (31120)

Last errors/warnings:
- E: Не удалось найти изображение «ES_s22.png»
- W: Could not get presets icon ES_s22.png
- E: Не удалось найти изображение «presets/water_tower.png»
- W: Could not get presets icon presets/water_tower.png
- W: XML document structures must start and end within the same entity. (строка 297, столбец 35)