Remove HTTP_VERSION validation from Rack::Lint. (#2154)

SPEC.rdoc

@@ -112,7 +112,6 @@ The <tt>SERVER_PORT</tt> must be an Integer if set.
 The <tt>SERVER_NAME</tt> must be a valid authority as defined by RFC7540.
 The <tt>HTTP_HOST</tt> must be a valid authority as defined by RFC7540.
 The <tt>SERVER_PROTOCOL</tt> must match the regexp <tt>HTTP/\d(\.\d)?</tt>.
-If the <tt>HTTP_VERSION</tt> is present, it must equal the <tt>SERVER_PROTOCOL</tt>.
 The environment must not contain the keys
 <tt>HTTP_CONTENT_TYPE</tt> or <tt>HTTP_CONTENT_LENGTH</tt>
 (use the versions without <tt>HTTP_</tt>).

lib/rack/lint.rb

@@ -288,11 +288,6 @@ def check_environment(env)
           raise LintError, "env[SERVER_PROTOCOL] does not match HTTP/\\d(\\.\\d)?"
         end
 
-        ## If the <tt>HTTP_VERSION</tt> is present, it must equal the <tt>SERVER_PROTOCOL</tt>.
-        if env['HTTP_VERSION'] && env['HTTP_VERSION'] != server_protocol
-          raise LintError, "env[HTTP_VERSION] does not equal env[SERVER_PROTOCOL]"
-        end
-
         ## The environment must not contain the keys
         ## <tt>HTTP_CONTENT_TYPE</tt> or <tt>HTTP_CONTENT_LENGTH</tt>
         ## (use the versions without <tt>HTTP_</tt>).

test/spec_lint.rb

@@ -65,13 +65,6 @@ def env(options = {})
     }.must_raise(Rack::Lint::LintError).
       message.must_match(/env\[SERVER_PROTOCOL\] does not match HTTP/)
 
-    lambda {
-      e = env
-      e["HTTP_VERSION"] = 'HTTP/1.0'
-      Rack::Lint.new(nil).call(e)
-    }.must_raise(Rack::Lint::LintError).
-      message.must_match(/env\[HTTP_VERSION\] does not equal env\[SERVER_PROTOCOL\]/)
-
     lambda {
       Rack::Lint.new(nil).call(env("HTTP_CONTENT_TYPE" => "text/plain"))
     }.must_raise(Rack::Lint::LintError).