Issue #8317 has been updated by Nobuyoshi Nakada.

Description updated

Why also semicolon-separated?

```diff
diff --git c/lib/uri/generic.rb w/lib/uri/generic.rb
index aba54c1..f2a2d56 100644
--- c/lib/uri/generic.rb
+++ w/lib/uri/generic.rb
@@ -1546,7 +1546,7 @@
 
       name = 'no_proxy'
       if no_proxy = ENV[name] || ENV[name.upcase]
-        no_proxy.scan(/([^:,]*)(?::(\d+))?/) {|host, port|
+        no_proxy.scan(/(?!\.)([^:,\s]+)(?::(\d+))?/) {|host, port|
           if /(\A|\.)#{Regexp.quote host}\z/i =~ self.host &&
             (!port || self.port == port.to_i)
             return nil
diff --git c/test/uri/test_generic.rb w/test/uri/test_generic.rb
index b759657..70c3a73 100644
--- c/test/uri/test_generic.rb
+++ w/test/uri/test_generic.rb
@@ -831,6 +831,10 @@
       assert_nil(URI("http://example.net/").find_proxy)
       assert_nil(URI("http://www.example.net/").find_proxy)
     }
+    with_env('http_proxy'=>'http://127.0.0.1:8080', 'no_proxy'=>'.example.net') {
+      assert_nil(URI("http://example.net/").find_proxy)
+      assert_nil(URI("http://www.example.net/").find_proxy)
+    }
   end
 
   def test_find_proxy_case_sensitive_env
```

----------------------------------------
Feature #8317: URI: no_proxy with whitespaces and leading dots.
https://bugs.ruby-lang.org/issues/8317#change-56966

* Author: Zachary Scott
* Status: Assigned
* Priority: Normal
* Assignee: akira yamada
----------------------------------------
From [GitHub#285](https://github.com/ruby/ruby/pull/285)

The previous implementation wouldn't allow for white-spaces nor a leading dot
in the `no_proxy` list. The latter is described in the wget documentation as a valid case.

By being more strict on the characters, which are counted to a domainname,
we allow for white-spaces.
Also, a possible leading dot will be handled gracefully.


---Files--------------------------------
285.patch (1.22 KB)


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