CODEWITHSUNDEEP
c#weberror-handlingrequestwebclient
Mohanad
Mohanad

Reputation: 185

C# (429) Too Many Requests

I've been using the WebClient in C# to get specific data from a webpage. That works well until I do it more than 2 times. If I do it more than more than 2 times it gives me the "(429) Too Many Requests." error. I have looked at other questions regarding this issue, by the way.

Upvotes: 6

Views: 27902

Answers (4)

Marc
Marc

Reputation: 107

This post is old, but I had the same issue downloading images from my webserver. I found the solution on this post

// THIS LINE IS THE IMPORTANT ONE
req.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; " +
                "Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; " +
                ".NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30618; " +
                "InfoPath.2; OfficeLiveConnector.1.3; OfficeLivePatch.0.0)";

I haven't had any issues since.

Upvotes: 0

Mel Bryan Flores
Mel Bryan Flores

Reputation: 11

I know that this thread is quite old. but I wanted to share solutions

Maybe you can try polly as interceptor to retry the request.

for the policy handler

            serviceCollection.AddHttpClient<IExternalAPI, ExternalAPI>(client =>
        {
            var url= "";
            url = config.GetSection("Config").GetValue<string>("baseUrl");
            client.BaseAddress = new Uri(url);
            client.DefaultRequestHeaders
                .Accept
                .Add(new MediaTypeWithQualityHeaderValue("application/json"));
        }).AddPolicyHandler((provider, request) =>
        {
            return Policy.HandleResult<HttpResponseMessage>(r => r.StatusCode == HttpStatusCode.TooManyRequests)
                .RetryAsync(1, async (response, retryCount, context) =>
                {
                    if (response.Result.StatusCode == HttpStatusCode.Unauthorized)
                    {
                        // Add delay here
                        Thread.Sleep(1000);
                        Logger.LogInformation("Unauthorized Request Occured, Re-authenticating");
                        await client.Authenticate();
                    }
                    // refresh auth token.

Upvotes: 1

BestDeveloper
BestDeveloper

Reputation: 344

I recomend to use this code. it's not freezes GUI (wait for 15 seconds):

   DateTime Tthen = DateTime.Now;
   do
   {
        //Your code or nothing...
        Application.DoEvents();
   }
   while (Tthen.AddSeconds(15) > DateTime.Now);

Upvotes: -1

vt100
vt100

Reputation: 1003

It is not a C# problem. It is response from the web server. Probably some kind of anti-DOS filter. Try to make a pause between requests i.e. System.Threading.Thread.Sleep(5000); before each requests.

Upvotes: 11

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