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POURL sometimes not being properly encoded - threading issue?
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copied!<p>I am working on a Windows Form application in C# and have a method like the following which is being accessed by multiple threads (precisely, by multiple background workers):</p> <pre><code>public Uri signURL(OAuthToken token, string url) { UriBuilder builder = new UriBuilder(addOAuthParameters(url)); NameValueCollection query = HttpUtility.ParseQueryString(builder.Query); query.Set("oauth_consumer_key", consumerKey); /* * & sometimes not replaced by %26 */ query.Set("oauth_signature", consumerSecret + "&" + token.Secret); query.Set("oauth_token", token.Token); builder.Query = query.ToString(); return builder.Uri; } </code></pre> <p>I use this method to sign an arbitrary URL with some required OAuth parameters and afterwards do an HttpWebRequest to retrieve the content.</p> <p><strong>Edit 1:</strong> Here is the content of the addOAuthParameter method:</p> <pre><code>private Uri addOAuthParameters(string uri) { UriBuilder builder = new UriBuilder(uri); NameValueCollection query = HttpUtility.ParseQueryString(builder.Query); query.Set("oauth_signature_method", "PLAINTEXT"); query.Set("oauth_timestamp", "" + (int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds); query.Set("oauth_nonce", "" + getNonce()); query.Set("oauth_version", "1.0"); builder.Query = query.ToString(); return builder.Uri; } </code></pre> <p>Sometimes, the oauth_signature parameter contains an ampersand although this should be properly encoded with %26 by the NameValueCollection object, and, as result, I get a "401 Unauthorized". I have the feeling this happens when the method is being accessed by multiple background workers (multiple threads?). Is that possible?</p> <p><strong>Edit 2:</strong> Okay, it seems that I've narrowed down the issue. If I do a <code>Debug.Assert(builder.Uri.ToString().Contain("%26") && builder.Uri.PathAndQuery.Contains("%26"));</code> it turns out that <code>builder.Uri.ToString()</code> does not contain the %26 while <code>builder.Uri.PathAndQuery</code> does. Now, why's that?</p> <p>Debugging the issue turned out to be very hard. Does anyone have any suggestions?</p>

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