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POTrouble encoding a u umlaut with in a .Net http handler
 

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  1. POTrouble encoding a u umlaut with in a .Net http handler
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    <p>I have a JavaScript request going to a ASP.Net (2.0) HTTP handler which passes the request to a java web service. In this system special characters, such as those with an accent do not get passed on correctly.</p> <p>E.G.</p> <ul> <li>Human input: <code>Düsseldorf</code></li> <li>becomes a JavaScript asynch request to <code>http://site/serviceproxy.ashx?q=D%FCsseldorf</code>, which is valid in ISO-8859-1 as well as in UTF-8 as far as I can tell. (unless it's %c3%bc in UTF-8)</li> <li><code>HttpContext.Current.Request.QueryString.Get("q")</code> returns <code>D�sseldorf</code> which is where trouble begins.</li> <li>but <code>HttpUtility.UrlEncode(HttpContext.Current.Request.QueryString.Get("q"), Encoding.GetEncoding("ISO-8859-1"))</code> returns <code>D%3fsseldorf</code> (a '?')</li> <li>and <code>HttpUtility.UrlEncode(HttpContext.Current.Request.QueryString.Get("q"), Encoding.UTF8)</code> returns <code>D%ef%bfsseldorf</code></li> </ul> <p>So it the value doesn't get decoded nor re-encoded correctly to be passed on to the java service.</p> <ul> <li>Notice <code>HttpContext.Current.Request.Url.Query</code> is <code>?q=D%FCsseldorf&amp;output=json&amp;from=1&amp;to=10</code></li> <li>while <code>HttpContext.Current.Request.QueryString.ToString()</code> is <code>q=D%ufffdsseldorf&amp;output=json&amp;from=1&amp;to=10</code></li> </ul> <p>Why is this, and how can I tell the <code>HttpContext</code> to honor the request headers which include:</p> <pre><code>Content-Type=application/x-www-form-urlencoded;+charset=UTF-8 </code></pre> <p>and decode the URL's <code>QueryString</code> using the UTF-8 charset.</p> <p>Addendum: As the answer notes, the trouble lies not so much in the decoding as the encoding; using <code>escape()</code> in JavaScript does not escape according to UTF-8, while using <code>encodeURIComponent()</code> does.</p>
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