C#•2y ago

❔ HttpClient exiting program during GetStringAsync() and GetAsync()

I'm sending a GET to an API, but when debugging, as soon as you step off the last line, it cuts out the program without returning any value. Does anyone have any ideas?

40 Replies

Angius•2y ago

Try wrapping it in a try/catch and see if there's some exception happening?

Japemaster Brad•2y ago

No exception thrown, just a clean exit. I've come across this before, I think it was something about using .GetAwaiter().GetResult(), but that doesn't seem to give me much I just used .WaitAsync() in try/catch and it threw an error for timing out

Auger•2y ago

Nah, you're awaiting, which is what you should be doing Are you hitting the console line?

Japemaster Brad•2y ago

Cuts out as I step onto it

Auger•2y ago

So, it isn't making it past line 17?

Japemaster Brad•2y ago

Auger•2y ago

The timeout exception you saw, could indicate the issue. If this is a GET request, you can try doing the same request from either a browser or postman to look into it You may want to ensure the API is reachable at all Try pasting the url you're trying to hit in your code, inside your browser

Japemaster Brad•2y ago

I actually built it in Postman first, then transferred all the data into VS, that's what confused me at first, it's almost like it's getting the response, ticking the box and cutting out

Auger•2y ago

You'll likely see a 401 since you won't have a bearer, but that at least means the API is reachable To me, it sounds like the async method isn't resolving and hanging until the default http timeout is hit So, I'd double check your requestUri Especially since you're concatenating strings to make it

Japemaster Brad•2y ago

Combed over it, and nothing 😦

Auger•2y ago

Try setting a breakpoint on line 17, and take that URL and post it into your browser. I would expect a 401, and it not to time out

Japemaster Brad•2y ago

Auger•2y ago

Yeah, so that's what I'd expect. So does it resolve in postman when you pass the bearer token?

Japemaster Brad•2y ago

I get a 200 with JSON if that's what you mean 🙂

Auger•2y ago

Hmm.. You might need more headers in your httpclient in C#

Japemaster Brad•2y ago

Honestly that could be it, I'll have a look at the documentation again and have a read. Will get back to you with findings, thanks for your help!

Unknown User•2y ago

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demidev_mb•2y ago

Disable just my code in debug settings, and enable all exception types so visual studio cache everything retry and see what's actually happening.

Unknown User•2y ago

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demidev_mb•2y ago

Yeah, try cache is required anyway

Unknown User•2y ago

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Henkypenky•2y ago

is this the thing where the console closes after finishing everything there is a setting for that

Unknown User•2y ago

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Henkypenky•2y ago

Unknown User•2y ago

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Henkypenky•2y ago

i'll leave you this for the future so you can log all http stuff to console

demidev_mb•2y ago

And don't forget to global exception events, they can help

Unknown User•2y ago

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Henkypenky•2y ago

public class LoggingHandler : DelegatingHandler
{
    public LoggingHandler(HttpMessageHandler innerHandler) : base(innerHandler)
    {
    }

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        Console.WriteLine("Request:");
        Console.WriteLine(request.ToString());
        if (request.Content != null)
        {
            Console.WriteLine(await request.Content.ReadAsStringAsync());
        }
        Console.WriteLine();

        HttpResponseMessage response = await base.SendAsync(request, cancellationToken);

        Console.WriteLine("Response:");
        Console.WriteLine(response.ToString());
        if (response.Content != null)
        {
            Console.WriteLine(await response.Content.ReadAsStringAsync());
        }
        Console.WriteLine();

        return response;
    }
}

public class LoggingHandler : DelegatingHandler
{
    public LoggingHandler(HttpMessageHandler innerHandler) : base(innerHandler)
    {
    }

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        Console.WriteLine("Request:");
        Console.WriteLine(request.ToString());
        if (request.Content != null)
        {
            Console.WriteLine(await request.Content.ReadAsStringAsync());
        }
        Console.WriteLine();

        HttpResponseMessage response = await base.SendAsync(request, cancellationToken);

        Console.WriteLine("Response:");
        Console.WriteLine(response.ToString());
        if (response.Content != null)
        {
            Console.WriteLine(await response.Content.ReadAsStringAsync());
        }
        Console.WriteLine();

        return response;
    }
}

HttpClient client = new HttpClient(new LoggingHandler(new HttpClientHandler()));

HttpClient client = new HttpClient(new LoggingHandler(new HttpClientHandler()));

Unknown User•2y ago

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Henkypenky•2y ago

just for quick glancing nothing more

Unknown User•2y ago

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Henkypenky•2y ago

it doesnt consume

Unknown User•2y ago

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Henkypenky•2y ago

it says in the docs it internally buffers it with LoadIntoBufferAsync() then copies it

Japemaster Brad•2y ago

The program exits out normally, same as before

a coding witch•2y ago

Did you try to execute mocking the value? are you sure that the issue is related with HttpClient?

Unknown User•2y ago

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Tvde1•2y ago

Are you sure everything is awaited? So not:

public static void Main()
{
    DoStuff();
}

public static async Task DoStuff()

public static void Main()
{
    DoStuff();
}

public static async Task DoStuff()

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ HttpClient exiting program during GetStringAsync() and GetAsync()