Revert "HTTPHeader.content_range throws error on non-byte units"

This reverts commit 63546bfc15.

lib/net/http/header.rb

@@ -338,8 +338,8 @@ module Net::HTTPHeader
   # fits inside the full entity body, as range of byte offsets.
   def content_range
     return nil unless @header['content-range']
-    m = %r<bytes\s+(\d+)-(\d+)/(\d+|\*)>i.match(self['Content-Range'])
-    return nil if m.nil?
+    m = %r<bytes\s+(\d+)-(\d+)/(\d+|\*)>i.match(self['Content-Range']) or
+        raise Net::HTTPHeaderSyntaxError, 'wrong Content-Range format'
     m[1].to_i .. m[2].to_i
   end
 

test/net/http/test_httpheader.rb

@@ -308,14 +308,6 @@ class HTTPHeaderTest < Test::Unit::TestCase
   end
 
   def test_content_range
-    @c['Content-Range'] = "bytes 0-499/1000"
-    assert_equal 0..499, @c.content_range
-    @c['Content-Range'] = "bytes 1-500/1000"
-    assert_equal 1..500, @c.content_range
-    @c['Content-Range'] = "bytes 1-1/1000"
-    assert_equal 1..1, @c.content_range
-    @c['Content-Range'] = "tokens 1-1/1000"
-    assert_equal nil, @c.content_range
   end
 
   def test_range_length
@@ -325,8 +317,6 @@ class HTTPHeaderTest < Test::Unit::TestCase
     assert_equal 500, @c.range_length
     @c['Content-Range'] = "bytes 1-1/1000"
     assert_equal 1, @c.range_length
-    @c['Content-Range'] = "tokens 1-1/1000"
-    assert_equal nil, @c.range_length
   end
 
   def test_chunked?