fix a bug of parsing the X-Forwarded-For header.
fix a bug of parsing the X-Forwarded-For header.

treefrogframework/treefrog-framework,treefrogframework/treefrog-framework,treefrogframework/treefrog-framework,AmiArt/treefrog-framework,AmiArt/treefrog-framework,AmiArt/treefrog-framework,AmiArt/treefrog-framework,treefrogframework/treefrog-framework,treefrogframework/treefrog-framework,AmiArt/treefrog-framework