nginx redirects POST requests to GET request

I have Rails 4.1 application with runs on `puma` web server. I use nginx as a proxy server. Several days ago everything worked very well. I updated my application, and suddenly some `POST` requests started to redirected to same url but as `GET` request. I've tried rollback to previous working versions, no success. I found very interesting behaviour. I tested my API with `curl`. - If I did `POST` request to the url `http://myapp.com/tasks/easy_task/calculate/` it redirects to same url but as `GET` request. - Then I did `POST`request to `http://myapp.com/`, returned 404 - Then I did `POST`request to `http://myapp.com/tasks`, returned 404 - Then I did `POST`request to `http://myapp.com/tasks/easy_task`, returned 404 - Then I did `POST`request to `http://myapp.com/tasks/easy_task/calculate`, returned 200. YAY! Same thing happened when I used chrome's app `Postman`. First it redirected, but after previous steps it works well. I use this app in my other application. I use `RestClient` to make http requests. When I try to make `POST` request it raises an exception `RestClient::MovedPermanently (301 Moved Permanently)`. - I reinstalled `nginx` to `1.7.3`. - Restarted server (virtual machine) - re deployed my app, deployed previous versions - no success :( I found similar questions on stackoverflow, but non of them gave me clue to fix this issue. I hope you can help me to solve this problem. Thanks in advance! Similar questions: - POST request turns into GET request - POST request mysteriously turn into GET request nginx config: ``` $ cat /etc/nginx/sites-enabled/myapp.com.conf # The file generated by Chef for mycompany upstream myapp_mycompany_com { server unix:/tmp/myapp.com-puma.sock; } server { server_name myapp.com; listen 80; access_log /var/log/nginx/myapp.com-access.log; error_log /var/log/nginx/myapp.com-error.log; root /home/projects/mycompany/myapp.com/current/public; gzip on; gzip_types text/plain text/xml application/xml application/xml+rss text/css text/javascript application/javascript application/json; error_page 551 =503 @maintenance; location @maintenance { rewrite ^(.*)$ /system/maintenance.html break; } set $maintenance 0; if (-f $document_root/system/maintenance.html) { set $maintenance 1; } if ($request_uri = /favicon.ico) { # Browsers will try to get favicon if it's not returned with 200ok status set $maintenance 0; } if ($maintenance) { # There can be several reasons for 503 error. We custom return 551 error # to ensure maintenance.html is only shown when it's really maintenance return 551; } rewrite ^/(.*)/$ /$1 permanent; # Truncate trailing slashes try_files $uri @rails; expires -1; location = /favicon.ico { try_files $uri =204; access_log off; log_not_found off; } location @rails { proxy_pass http://myapp_mycompany_com; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $http_host; proxy_redirect off; proxy_intercept_errors on; expires -1; } error_page 500 502 503 504 /500.html; error_page 403 /403.html; error_page 404 /404.html; client_max_body_size 50M; keepalive_timeout 10; } ``` Puma ``` $ bundle exec puma -d -e production -b unix:///tmp/myapp.com-puma.sock --pidfile /home/projects/mycompany/myapp.com/shared/tmp/pids/puma.pid $ ``` Example of access.log ``` 123.123.123.123 - - [11/Jul/2014:05:44:17 +0000] "POST /tasks/easy_task/calculate/ HTTP/1.1" 301 184 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2073.0 Safari/537.36" 123.123.123.123 - - [11/Jul/2014:05:44:17 +0000] "GET /tasks/easy_task/calculate HTTP/1.1" 404 713 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2073.0 Safari/537.36" ... 123.123.123.123 - - [11/Jul/2014:06:04:17 +0000] "POST / HTTP/1.1" 404 713 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2073.0 Safari/537.36" 123.123.123.123 - - [11/Jul/2014:06:04:26 +0000] "POST /tasks HTTP/1.1" 404 713 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2073.0 Safari/537.36" 123.123.123.123 - - [11/Jul/2014:06:04:36 +0000] "POST /tasks/easy_task HTTP/1.1" 404 713 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2073.0 Safari/537.36" 123.123.123.123 - - [11/Jul/2014:06:04:42 +0000] "POST /tasks/easy_task/calculate HTTP/1.1" 200 104 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2073.0 Safari/537.36" ```