38 lines
1.6 KiB
C#
38 lines
1.6 KiB
C#
//------------------------------------------------------------------------------
|
|
// <copyright file="HeaderUtility.cs" company="Microsoft">
|
|
// Copyright (c) Microsoft Corporation. All rights reserved.
|
|
// </copyright>
|
|
//------------------------------------------------------------------------------
|
|
|
|
namespace System.Web.Util {
|
|
using System;
|
|
|
|
internal static class HeaderUtility {
|
|
public static bool IsEncodingInAcceptList(string acceptEncodingHeader, string expectedEncoding) {
|
|
if (String.IsNullOrEmpty(acceptEncodingHeader)) {
|
|
return false;
|
|
}
|
|
|
|
foreach (string encoding in acceptEncodingHeader.Split(',')) {
|
|
string e = encoding.Trim();
|
|
|
|
// This code will typically handle all existing browsers, which
|
|
// use "encoding1, encoding2" for this header.
|
|
// IE, Firefox and Safari are sending "gzip, deflate"
|
|
// Opera is sending "deflate, gzip, x-gzip, identity, *;q=0"
|
|
// There is a currently hypothetical case where a browser would use the quantified syntax
|
|
// on specific encodings ("encoding1;q=0.8, encoding2 ;q=0.2") which we don't handle here.
|
|
// For those situations, the browser would get the uncompressed version.
|
|
// See RFC 2068 for details.
|
|
if (String.Equals(e, expectedEncoding, StringComparison.Ordinal)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// no match found
|
|
return false;
|
|
}
|
|
|
|
}
|
|
}
|