[ruby/rack] Remove Unicorn (#10228)

Unicorn hasn't been updated for 4 years and seems unmaintained.
It isn't the fastest on any of the benchmarks either.

Author: p8

frameworks/Ruby/rack/Gemfile

@@ -35,11 +35,6 @@ group :puma, optional: true do
   gem 'puma', '~> 7.1'
 end
 
-group :unicorn, optional: true do
-  gem 'logger' # required by unicorn on Ruby 3.5
-  gem 'unicorn', '~> 6.1', platforms: %i[ruby windows]
-end
-
 group :development, optional: true do
   gem 'rack-test'
   gem 'rubocop', platforms: %i[ruby windows]

frameworks/Ruby/rack/Gemfile.lock

@@ -61,7 +61,6 @@ GEM
     io-stream (0.6.1)
     iodine (0.7.58)
     json (2.13.2)
-    kgio (2.11.4)
     language_server-protocol (3.17.0.4)
     lint_roller (1.1.0)
     localhost (1.3.1)
@@ -104,7 +103,6 @@ GEM
     rackup (2.2.1)
       rack (>= 3)
     rainbow (3.1.1)
-    raindrops (0.20.1)
     rake (13.3.0)
     regexp_parser (2.10.0)
     rubocop (1.73.2)
@@ -137,9 +135,6 @@ GEM
     unicode-display_width (3.1.4)
       unicode-emoji (~> 4.0, >= 4.0.4)
     unicode-emoji (4.0.4)
-    unicorn (6.1.0)
-      kgio (~> 2.6)
-      raindrops (~> 0.7)
 
 PLATFORMS
   arm64-darwin-24
@@ -163,7 +158,6 @@ DEPENDENCIES
   sequel
   sequel_pg
   tzinfo-data (= 1.2023.3)
-  unicorn (~> 6.1)
 
 BUNDLED WITH
    2.7.0

frameworks/Ruby/rack/benchmark_config.json

@@ -44,27 +44,6 @@
         "display_name": "rack-iodine-mri-sequel-raw",
         "notes": ""
       },
-      "unicorn": {
-        "json_url": "/json",
-        "plaintext_url": "/plaintext",
-        "db_url": "/db",
-        "query_url": "/queries?queries=",
-        "fortune_url": "/fortunes",
-        "update_url": "/updates?queries=",
-        "port": 8080,
-        "approach": "Realistic",
-        "classification": "Platform",
-        "orm": "raw",
-        "database": "Postgres",
-        "framework": "rack",
-        "language": "Ruby",
-        "platform": "Mri",
-        "webserver": "Unicorn",
-        "os": "Linux",
-        "database_os": "Linux",
-        "display_name": "rack-unicorn-mri-sequel-raw",
-        "notes": ""
-      },
       "falcon": {
         "json_url": "/json",
         "plaintext_url": "/plaintext",

frameworks/Ruby/rack/config/unicorn.rb

@@ -101,15 +101,7 @@ def respond(content_type, body)
     ]
   end
 
-  if defined?(Unicorn)
-    def headers(content_type, body)
-      {
-        CONTENT_TYPE => content_type,
-        SERVER => SERVER_STRING,
-        CONTENT_LENGTH => body.bytesize.to_s
-      }
-    end
-  elsif defined?(Falcon) || defined?(Puma)
+  if defined?(Falcon) || defined?(Puma)
     def headers(content_type, _)
       {
         CONTENT_TYPE => content_type,