I have the following method that returns the Http status code
of a given Url
:
public static async void makeRequest(int row, string url) { string result; Stopwatch sw = new Stopwatch(); sw.Start(); try { using (HttpClient client = new HttpClient()) { HttpResponseMessage response = new HttpResponseMessage(); response = await client.GetAsync(url); // dump contents of header Console.WriteLine(response.Headers.ToString()); if (response.IsSuccessStatusCode) { result = ((int)response.StatusCode).ToString(); } else { result = ((int)response.StatusCode).ToString(); } } } catch (HttpRequestException hre) { result = "Server unreachable"; } sw.Stop(); long time = sw.ElapsedTicks / (Stopwatch.Frequency / (1000L * 1000L)); requestComplete(row, url, result, time); }
It works well for 200
/404
etc, however in the case of 301
codes I believe the returned result is the already-redirected (200
) result, rather than the actual 301
that should be returned and which would have a header containing where the redirect would be pointed to.
I have seen something like this in other .Net web requests classes and the technique there was to set some sort of allowAutoRedirect
property to false. If this is along the right lines, can anyone tell me the correct alternative for the HttpClient
class?
This post has info on the above allowAutoRedirect concept I mean
Else, how might I get this method to return 301s
rather than 200s
for Urls I know to be genuine 301s
?
In HTTP, redirection is triggered by a server sending a special redirect response to a request. Redirect responses have status codes that start with 3 , and a Location header holding the URL to redirect to. When browsers receive a redirect, they immediately load the new URL provided in the Location header.
As a rule, when you use an IDisposable object, you should declare and instantiate it in a using statement. Secondly, all code you may have seen since…the inception of HttpClient would have told you to use a using statement block, including recent docs on the ASP.NET site itself.
Click the URL Redirects tab. In the upper right, click Add URL redirect. In the right panel, select the Standard or Flexible redirect type. A standard redirect is used to redirect one URL to another.
I have found that the way to do this is by creating an instance of HttpClientHandler
and passing it in the constructor of HttpClient
public static async void makeRequest(int row, string url) { string result; Stopwatch sw = new Stopwatch(); sw.Start(); // added here HttpClientHandler httpClientHandler = new HttpClientHandler(); httpClientHandler.AllowAutoRedirect = false; try { // passed in here using (HttpClient client = new HttpClient(httpClientHandler)) { }
See here for more info.
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