# Mime::Type::InvalidMimeType - Is this a hacking attack? **URL:** \ **Category:** Product Support\ **Created:** [April 1, 2021, 9:42am UTC](https://meta.discourse.org/t/mime-invalidmimetype-is-this-a-hacking-attack/185087 "2021-04-01T09:42:35Z")\ **Posts on this page:** 1\ **Showing post:** 1
**Author:** ![Don](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/don/32/228726_2.png) [@Don](https://meta.discourse.org/u/Don)\ **Post date:** [April 1, 2021, 9:42am UTC](https://meta.discourse.org/t/mime-invalidmimetype-is-this-a-hacking-attack/185087/1 "2021-04-01T09:42:35Z")
Hello Everybody, Should i do something with it? We get probably 2 times a day. The addheader is always different random. ![Screenshot 2021-04-01 at 11.31.24](https://global.discourse-cdn.com/meta/optimized/3X/0/9/09a0e178f1ba37f9441755c1736fc22ae6fd9a12_2_690x29.png) Thanks for your response 🙂 From logs: > **INFO** > > ``` > Mime::Type::InvalidMimeType ("%{#context['com.opensymphony.xwork2.dispatcher.httpservletresponse'].addheader('lffk5fkc'" is not a valid MIME type) > lib/middleware/omniauth_bypass_middleware.rb:71:in `call' > lib/content_security_policy/middleware.rb:12:in `call' > lib/middleware/anonymous_cache.rb:353:in `call' > config/initializers/008-rack-cors.rb:25:in `call' > config/initializers/100-quiet_logger.rb:23:in `call' > config/initializers/100-silence_logger.rb:31:in `call' > lib/middleware/enforce_hostname.rb:23:in `call' > lib/middleware/request_tracker.rb:177:in `call' > > ``` > **BACKTRACE** > > ``` > actionpack (6.0.3.5) lib/action_dispatch/http/mime_type.rb:235:in `initialize' > > actionpack (6.0.3.5) lib/action_dispatch/http/mime_type.rb:143:in `new' > > actionpack (6.0.3.5) lib/action_dispatch/http/mime_type.rb:143:in `lookup' > > actionpack (6.0.3.5) lib/action_dispatch/http/mime_negotiation.rb:23:in `block in content_mime_type' > > rack (2.2.3) lib/rack/request.rb:69:in `fetch' > > rack (2.2.3) lib/rack/request.rb:69:in `fetch_header' > > actionpack (6.0.3.5) lib/action_dispatch/http/mime_negotiation.rb:21:in `content_mime_type' > > actionpack (6.0.3.5) lib/action_dispatch/http/request.rb:263:in `media_type' > > actionpack (6.0.3.5) lib/action_dispatch/http/request.rb:348:in `form_data?' > > rack (2.2.3) lib/rack/request.rb:445:in `POST' > > actionpack (6.0.3.5) lib/action_dispatch/http/request.rb:390:in `block (2 levels) in POST' > > actionpack (6.0.3.5) lib/action_dispatch/http/parameters.rb:106:in `parse_formatted_parameters' > > actionpack (6.0.3.5) lib/action_dispatch/http/request.rb:389:in `block in POST' > > rack (2.2.3) lib/rack/request.rb:69:in `fetch' > > rack (2.2.3) lib/rack/request.rb:69:in `fetch_header' > > actionpack (6.0.3.5) lib/action_dispatch/http/request.rb:388:in `POST' > > actionpack (6.0.3.5) lib/action_dispatch/http/parameters.rb:55:in `parameters' > > actionpack (6.0.3.5) lib/action_dispatch/http/mime_negotiation.rb:66:in `block in formats' > > rack (2.2.3) lib/rack/request.rb:69:in `fetch' > > rack (2.2.3) lib/rack/request.rb:69:in `fetch_header' > > actionpack (6.0.3.5) lib/action_dispatch/http/mime_negotiation.rb:64:in `formats' > > actionpack (6.0.3.5) lib/action_dispatch/http/mime_negotiation.rb:60:in `format' > > actionpack (6.0.3.5) lib/action_dispatch/journey/route.rb:168:in `block in matches?' > > actionpack (6.0.3.5) lib/action_dispatch/journey/route.rb:165:in `each' > > actionpack (6.0.3.5) lib/action_dispatch/journey/route.rb:165:in `all?' > > actionpack (6.0.3.5) lib/action_dispatch/journey/route.rb:165:in `matches?' > > actionpack (6.0.3.5) lib/action_dispatch/journey/router.rb:148:in `block in match_routes' > > actionpack (6.0.3.5) lib/action_dispatch/journey/router.rb:148:in `select' > > actionpack (6.0.3.5) lib/action_dispatch/journey/router.rb:148:in `match_routes' > > actionpack (6.0.3.5) lib/action_dispatch/journey/router.rb:116:in `find_routes' > > actionpack (6.0.3.5) lib/action_dispatch/journey/router.rb:32:in `serve' > > actionpack (6.0.3.5) lib/action_dispatch/routing/route_set.rb:834:in `call' > > lib/middleware/omniauth_bypass_middleware.rb:71:in `call' > > rack (2.2.3) lib/rack/tempfile_reaper.rb:15:in `call' > > rack (2.2.3) lib/rack/conditional_get.rb:27:in `call' > > rack (2.2.3) lib/rack/head.rb:12:in `call' > > lib/content_security_policy/middleware.rb:12:in `call' > > lib/middleware/anonymous_cache.rb:353:in `call' > > config/initializers/008-rack-cors.rb:25:in `call' > > rack (2.2.3) lib/rack/session/abstract/id.rb:266:in `context' > > rack (2.2.3) lib/rack/session/abstract/id.rb:260:in `call' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/cookies.rb:648:in `call' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/callbacks.rb:27:in `block in call' > > activesupport (6.0.3.5) lib/active_support/callbacks.rb:101:in `run_callbacks' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/callbacks.rb:26:in `call' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/actionable_exceptions.rb:18:in `call' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/debug_exceptions.rb:32:in `call' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call' > > logster (2.9.6) lib/logster/middleware/reporter.rb:43:in `call' > > railties (6.0.3.5) lib/rails/rack/logger.rb:37:in `call_app' > > railties (6.0.3.5) lib/rails/rack/logger.rb:28:in `call' > > config/initializers/100-quiet_logger.rb:23:in `call' > > config/initializers/100-silence_logger.rb:31:in `call' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/remote_ip.rb:81:in `call' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/request_id.rb:27:in `call' > > lib/middleware/enforce_hostname.rb:23:in `call' > > rack (2.2.3) lib/rack/method_override.rb:24:in `call' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/executor.rb:14:in `call' > > rack (2.2.3) lib/rack/sendfile.rb:110:in `call' > > actionpack (6.0.3.5) lib/action_dispatch/middleware/host_authorization.rb:76:in `call' > > rack-mini-profiler (2.3.1) lib/mini_profiler/profiler.rb:248:in `call' > > message_bus (3.3.4) lib/message_bus/rack/middleware.rb:61:in `call' > > lib/middleware/request_tracker.rb:177:in `call' > > railties (6.0.3.5) lib/rails/engine.rb:527:in `call' > > railties (6.0.3.5) lib/rails/railtie.rb:190:in `public_send' > > railties (6.0.3.5) lib/rails/railtie.rb:190:in `method_missing' > > rack (2.2.3) lib/rack/urlmap.rb:74:in `block in call' > > rack (2.2.3) lib/rack/urlmap.rb:58:in `each' > > rack (2.2.3) lib/rack/urlmap.rb:58:in `call' > > unicorn (6.0.0) lib/unicorn/http_server.rb:634:in `process_client' > > unicorn (6.0.0) lib/unicorn/http_server.rb:732:in `worker_loop' > > unicorn (6.0.0) lib/unicorn/http_server.rb:547:in `spawn_missing_workers' > > unicorn (6.0.0) lib/unicorn/http_server.rb:143:in `start' > > unicorn (6.0.0) bin/unicorn:128:in `' > > vendor/bundle/ruby/2.7.0/bin/unicorn:23:in `load' > > vendor/bundle/ruby/2.7.0/bin/unicorn:23:in `
' > > ``` --- _[View the full topic](https://meta.discourse.org/t/mime-invalidmimetype-is-this-a-hacking-attack/185087)._