Fix streaming API redirection ignoring the port of streaming_api_base_url

[ClearlyClaire]

See #28539 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cd09be0) 84.59% compared to head (adf76a6) 84.59%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #28558   +/-   ##
=======================================
  Coverage   84.59%   84.59%           
=======================================
  Files        1039     1039           
  Lines       28238    28240    +2     
  Branches     4550     4550           
=======================================
+ Hits        23889    23891    +2     
  Misses       3197     3197           
  Partials     1152     1152           

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[ThisIsMissEm]

I think the check of if Rails.configuration.x.streaming_api_base_url == request.host may actually be wrong too, since that configuration option is a full URL potentially.

[ClearlyClaire]

You are right, this comparison will always evaluate to false, as Rails.configuration.x.streaming_api_base_url is an URL (with scheme and potentially port number) while request.host is the host without port nor port number. I will address that in another PR.