Fix Rack LintError from uppercase response headers for client_dev (#628)

coalest · web-flow · commit bc57e02ec83f · 2025-02-11T10:24:02.000+09:00
* Fix Rack LintError from uppercase response headers for client_dev

* Add changelog entry
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## Unreleased
 
 - [BREAKING CHANGE] Ruby version 3.1.0 or later is required. [#632](https://github.com/MiniProfiler/rack-mini-profiler/pull/632)
+- [FIX] Lower case HTTP response headers to be compatible with Rack 3 [#628](https://github.com/MiniProfiler/rack-mini-profiler/pull/628)
 - [FIX] Truncate long profiler name in profiler popup. [#634](https://github.com/MiniProfiler/rack-mini-profiler/pull/634)
 - [FIX] `flamegraph_mode` query param having no effect. [#635](https://github.com/MiniProfiler/rack-mini-profiler/pull/635)
 - [FEATURE] Show record type and count in SQL query UI. [#638](https://github.com/MiniProfiler/rack-mini-profiler/pull/638)
diff --git a/lib/mini_profiler/actions.rb b/lib/mini_profiler/actions.rb
@@ -5,7 +5,7 @@ module Actions
       def serve_snapshot(env)
         MiniProfiler.authorize_request
         status = 200
-        headers = { 'Content-Type' => 'text/html' }
+        headers = { 'content-type' => 'text/html' }
         qp = Rack::Utils.parse_nested_query(env['QUERY_STRING'])
         if group_name = qp["group_name"]
           list = @storage.snapshots_group(group_name)
@@ -56,9 +56,9 @@ def serve_file(env, file_name:)
         resources_env['PATH_INFO'] = file_name
 
         if Gem::Version.new(Rack.release) >= Gem::Version.new("2.1.0")
-          rack_file = Rack::Files.new(resources_root, 'Cache-Control' => "max-age=#{cache_control_value}")
+          rack_file = Rack::Files.new(resources_root, 'cache-control' => "max-age=#{cache_control_value}")
         else
-          rack_file = Rack::File.new(resources_root, 'Cache-Control' => "max-age=#{cache_control_value}")
+          rack_file = Rack::File.new(resources_root, 'cache-control' => "max-age=#{cache_control_value}")
         end
 
         rack_file.call(resources_env)
@@ -93,11 +93,11 @@ def serve_results(env)
         # If we're an XMLHttpRequest, serve up the contents as JSON
         if request.xhr?
           result_json = page_struct.to_json
-          [200, { 'Content-Type' => 'application/json' }, [result_json]]
+          [200, { 'content-type' => 'application/json' }, [result_json]]
         else
           # Otherwise give the HTML back
           html = generate_html(page_struct, env)
-          [200, { 'Content-Type' => 'text/html' }, [html]]
+          [200, { 'content-type' => 'text/html' }, [html]]
         end
       end
 
diff --git a/lib/mini_profiler/views.rb b/lib/mini_profiler/views.rb
@@ -110,7 +110,7 @@ def make_link(postfix, env)
       end
 
       def flamegraph(graph, path, env)
-        headers = { 'Content-Type' => 'text/html' }
+        headers = { 'content-type' => 'text/html' }
         iframe_src = "#{public_base_path(env)}speedscope/index.html"
         html = <<~HTML
           <!DOCTYPE html>
@@ -141,7 +141,7 @@ def flamegraph(graph, path, env)
       end
 
       def help(client_settings, env)
-        headers = { 'Content-Type' => 'text/html' }
+        headers = { 'content-type' => 'text/html' }
         html = <<~HTML
           <!DOCTYPE html>
           <html>
