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Lowercase response headers#24

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sshaw merged 1 commit intosshaw:masterfrom
fjmorel:rack-lowercase-headers
Dec 5, 2025
Merged

Lowercase response headers#24
sshaw merged 1 commit intosshaw:masterfrom
fjmorel:rack-lowercase-headers

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@fjmorel
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@fjmorel fjmorel commented Dec 5, 2025

Use lowercase headers to resolve errors due to rack/rack#1592 after upgrading Rack.

@sshaw
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sshaw commented Dec 5, 2025

Thanks for this. Glad to see this middleware is used. Heh. Please share your use case if you can.

CI failures are unrelated.

In Rack 3 what happens when a header is not lowercase?

@sshaw sshaw merged commit 41aae4f into sshaw:master Dec 5, 2025
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@fjmorel
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fjmorel commented Dec 5, 2025

I love this project! It handles converting everything the labels give us from XML to JSON. It's much easier to work with after that, even if we have to look in multiple places for info based on the version and partner.

In the (default) development environment, you get a 500 with this in the logs:

Rack::Lint::LintError: uppercase character in header name: Content-Type (Rack::Lint::LintError)
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rack-3.2.4/lib/rack/lint.rb:729:in 'block in Rack::Lint::Wrapper#check_headers'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rack-3.2.4/lib/rack/lint.rb:714:in 'Hash#each'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rack-3.2.4/lib/rack/lint.rb:714:in 'Rack::Lint::Wrapper#check_headers'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rack-3.2.4/lib/rack/lint.rb:104:in 'Rack::Lint::Wrapper#response'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rack-3.2.4/lib/rack/lint.rb:16:in 'Rack::Lint#call'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rack-3.2.4/lib/rack/show_exceptions.rb:31:in 'Rack::ShowExceptions#call'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rack-3.2.4/lib/rack/common_logger.rb:43:in 'Rack::CommonLogger#call'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rack-3.2.4/lib/rack/content_length.rb:20:in 'Rack::ContentLength#call'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rackup-2.3.1/lib/rackup/handler/webrick.rb:145:in 'Rackup::Handler::WEBrick#service'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/rackup-2.3.1/lib/rackup/handler/webrick.rb:28:in 'Rackup::Handler::WEBrick::Server#service'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/webrick-1.9.2/lib/webrick/httpserver.rb:96:in 'WEBrick::HTTPServer#run'
        /home/fmore/.rbenv/versions/3.4.1/lib/ruby/gems/3.4.0/gems/webrick-1.9.2/lib/webrick/server.rb:309:in 'block in WEBrick::GenericServer#start_thread'
127.0.0.1 - - [05/Dec/2025:18:33:13 -0500] "POST / HTTP/1.1" 500 45514 0.3163

In deployment mode, though, it works fine.

127.0.0.1 - - [05/Dec/2025:18:33:56 -0500] "POST / HTTP/1.1" 200 - 0.2983

@sshaw
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sshaw commented Dec 6, 2025

Thanks for the info.

Hurmm you're runnin' on 3.4. Did you have to make dependency tweaks to get ROXML to work? I just added some to master in 6d31f8e and will be making a release shortly.

@fjmorel fjmorel deleted the rack-lowercase-headers branch December 7, 2025 16:38
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fjmorel commented Dec 7, 2025

I don't know much about Ruby. It's mostly Dependabot keeping this service up to date for us now.

Here's my config.ru:

require "rack/ddex"

# https://github.com/rack/rack/wiki/(tutorial)-rackup-howto
run Rack::DDEX.new

and Gemfile:

source 'https://rubygems.org'

gem "rexml"
gem "rackup"
gem "rack", "~> 3.2"
gem "webrick", "~> 1.9"
gem "ddex"

and it's run with

bundle exec rackup --port 9292 --host 0.0.0.0 -I ddex/lib config.ru -E deployment

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@fjmorel @sshaw

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