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PODifference between operation has time out and (504) Gateway Timeout
 

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  1. PODifference between operation has time out and (504) Gateway Timeout
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    <p>I am using <code>HttpWebRequest</code> in my application which is checking some URI's in multiple threads. I am getting multiple types of time out exceptions. </p> <ul> <li>The operation has timed out</li> <li>The remote server returned an error: (504) Gateway Timeout.</li> </ul> <p>Their details are like:</p> <blockquote> <p>System.Net.WebException: The operation has timed out at System.Net.HttpWebRequest.GetResponse() at ......</p> </blockquote> <p>and </p> <blockquote> <p>System.Net.WebException: The remote server returned an error: (504) Gateway Timeout. at System.Net.HttpWebRequest.GetResponse() at ....</p> </blockquote> <p>What is the different between these two. </p> <p>My function is like:</p> <pre><code>public bool CheckUri(Uri m_url) { try { HttpWebRequest request = HttpWebRequest.Create(m_url) as HttpWebRequest; request.UserAgent = "MyUserAgent"; //For: The underlying connection was closed: An unexpected error occurred on a receive. request.KeepAlive = false; request.ProtocolVersion = HttpVersion.Version10; request.Method = "HEAD"; //Get only the header information using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { int statusCode = (int)response.StatusCode; if (statusCode &gt;= 100 &amp;&amp; statusCode &lt; 400) //Good requests { string sContent = null; using (var stream = response.GetResponseStream()) using (StreamReader loResponseStream = new StreamReader(stream)) sContent = loResponseStream.ReadToEnd(); return true; } else { return false; //hard to reach here } } } //vexing exception catch (WebException ex) { if (ex.Status == WebExceptionStatus.ProtocolError) //400 errors { var response = ex.Response as HttpWebResponse; if (response != null) { Console.WriteLine("HTTP Status Code: " + (int)response.StatusCode); Console.WriteLine(response.StatusCode); } } else { Console.WriteLine(ex.Message); } return false; } catch (Exception ex) { Console.WriteLine(ex.Message); return false; } } </code></pre> <p>Also If anyone could tell me, would there be an issue if multiple threads call this method with different URIs. I am not getting any cross thread exception. This method is actually a part of a windows service which monitors a list of almost 200 URIs. </p>
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    1. USuser2711965
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      1. PODifference between operation has time out and (504) Gateway Timeout
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      1. VTUpMod
    1. COOne is a direct timeout, i.e. your specific operation; the other means the gateway (a route en route to the destination) suffered a timeout. Did you Google? There are plenty of references.
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      1. USGrant Thomas
    2. CO@GrantThomas, I tried, but I am not sure if they are same or different.
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      1. USuser2711965
 

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