id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,uname,nginx_version 1820,text/x-gwt-rpc post failing sometimes,simon.verzijl.verzity.nl@…,,"We have a Nginx reverse proxy configured in front of a TIBCO AMX-BPM backend system. This works fine for 99% but when repeating the same browser activity/same payload every now and then we get a HTTP/400 returned from Nginx. In the access.log we see the following 'garbage' appearing : {{{ 10.29.140.34 - - [25/Jul/2019:07:50:15 +0200] ""GET / HTTP/1.1"" 200 396 ""-"" ""Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"" 10.29.140.34 - - [25/Jul/2019:08:25:09 +0200] ""NameList\x22:[], \x22noTenantsObjNameList\x22:[]}}, {\x22$param\x22:\x22objectSearchFlag\x22, \x22mode\x22:\x22INOUT\x22, \x22type\x22:\x22BOOLEAN\x22, \x22$value\x22:false}, {\x22$param\x22:\x22CurrentObject\x22, \x22mode\x22:\x22INOUT\x22, \x22$value\x22:{\x22$type\x22:\x22nl.abnamro.dvb.objects.ObjectList\x22, \x22buildingUnits\x22:[], \x22pandUnits\x22:[], \x22huurders\x22:[]}}, {\x22$param\x22:\x22BrowseWithObjSearch\x22, \x22mode\x22:\x22INOUT\x22, \x22type\x22:\x22BOOLEAN\x22, \x22$value\x22:false}, {\x22$param\x22:\x22TotalTenantCount\x22, \x22mode\x22:\x22INOUT\x22, \x22type\x22:\x22INTEGER\x22, \x22$value\x22:\x2230\x22}]}|http://vm00004085.nl.eu.abnamro.com:8090/bpmresources/1.0.0.20190723113809420/openspaceGWTPull_DefaultChannel/DVB_NewAnalysisbs/OrchestrationProcess/SituationNew/SituationNew.gwt.json|java.util.ArrayList/4159755760|pvm:0a10a0|com.tibco.bpm.web.client.model.types.BusinessServiceTemplate/1666351301|nl.abnamro.dvb.launchDashboard/DVB_Dashboard|/nl.abnamro.dvb.launchDashboard/Process Packages/DVB_Dashboard.xpdl|MainDashboard|1.0.0.20190613125639319|openspaceGWTPull_DefaultChannel|1|2|3|4|3|5|6|7|5|8|9|10|0|A|11|0|11|0|0|0|11|0|0|12|A|0|13|14|15|16|17|18|"" 400 157 ""-"" ""-"" }}} The actual payload from (Chrome) browser was this : {{{ Request URL: http://vm00004085.nl.eu.abnamro.com:8090/bpm/BusinessServiceGadgetService Request Method: POST Status Code: 400 Bad Request Remote Address: 10.240.48.246:8090 Referrer Policy: no-referrer-when-downgrade Connection: close Content-Length: 157 Content-Type: text/html Date: Thu, 25 Jul 2019 06:25:09 GMT Server: nginx/1.17.1 Accept: */* Accept-Encoding: gzip, deflate Accept-Language: en-US,en;q=0.9 Connection: keep-alive Content-Length: 17380 Content-Type: text/x-gwt-rpc; charset=UTF-8 Cookie: JSESSIONID=90v78927nhxlvmqidekbfg8j; s_fid=7908B30519ED0DEB-3144CC6E1F994BDF; s_cahi=%5B%5B%27Direct%27%2C%271551088986099%27%5D%5D; _ga=GA1.2.1729516751.1558944295; s_new_repeat=1563429121440-Repeat Host: vm00004085.nl.eu.abnamro.com:8090 Origin: http://vm00004085.nl.eu.abnamro.com:8090 Referer: http://vm00004085.nl.eu.abnamro.com:8090/openspace/?locale=en_US&ldap=true User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36 X-GWT-Module-Base: http://vm00004085.nl.eu.abnamro.com:8090/openspace/ X-GWT-Permutation: 5F7B9556913825225907FA19BA273057 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worker_processes 1; error_log logs/error.log info; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; # keepalive_timeout 65; sendfile on; gzip on; # http://nginx.org/en/docs/varindex.html for all vars log_format custom '$remote_addr $http_host $remote_user $timestr ""$request"" $status $body_bytes_sent \""$http_referer\"" \""$http_user_agent\"" $request_time $request_length'; server { listen 10.240.48.246:8090; if ($time_iso8601 ~ ""^(\d{4})-(\d{2})-(\d{2})"") { set $year $1; set $month $2; set $day $3; } chunked_transfer_encoding off; client_max_body_size 10M; client_body_buffer_size 8k; client_body_in_file_only on; set_formatted_local_time $timestr ""%Y-%m-%d %H:%M:%S""; location / { proxy_pass http://127.0.0.1:8090; proxy_set_header Host $host:$server_port; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; access_log logs/access_log_DVB.$year.$month.$day custom; } } } }}} Some other times the error is not 'garbage' in the access.log, but the POST body itself is incomplete, or rather wrapped arround/shifted in client_body_temp/. I have not been able to reproduce this error, but when I do I will add it as well. ",defect,closed,major,,other,1.17.x,invalid,,simon.verzijl@…,Linux vm00004085 2.6.32-754.15.3.el6.x86_64 #1 SMP Thu Jun 13 22:49:44 EDT 2019 x86_64 x86_64 x86_64 GNU/Linux,"nginx version: nginx/1.17.1 (CentOS) built by gcc 4.4.7 20120313 (Red Hat 4.4.7-23) (GCC) built with OpenSSL 1.0.1e-fips 11 Feb 2013 TLS SNI support enabled configure arguments: --prefix=/appl/tib/nginx --modules-path=/appl/tib/nginx/modules --with-http_ssl_module --add-module=/tmp/ngx_devel_kit-0.3.1rc1 --add-module=/tmp/set-misc-nginx-module-0.32 --build=CentOS --with-select_module --with-poll_module --with-threads --with-file-aio --with-http_v2_module --with-http_realip_module --with-http_addition_module --with-http_xslt_module=dynamic --with-http_image_filter_module=dynamic --with-http_geoip_module=dynamic --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_auth_request_module --with-http_random_index_module --with-http_secure_link_module --with-http_degradation_module --with-http_slice_module --with-http_stub_status_module --with-http_perl_module=dynamic --with-perl_modules_path=/usr/lib64/perl5 --with-perl=/usr/bin/perl --with-mail=dynamic --with-mail_ssl_module --with-stream=dynamic --with-stream_ssl_module --with-stream_realip_module --with-stream_geoip_module=dynamic --with-stream_ssl_preread_module --with-compat --with-openssl-opt=no-nextprotoneg --with-debug --http-log-path=/appl/tib/nginx/logs/access.log --error-log-path=/appl/tib/nginx/logs/error.log "