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//------------------------------------------------------------------------------
// <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;
}
}
}
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