HttpClient hangs forever

Unity Engine
,
1

Hello,

My project have suddenly started hanging when I run in the editor.

I have disabled all scripts except the one that fetches the data:

using System;
using System.Net.Http;
using System.Threading.Tasks;
using UnityEngine;

public class DataFetcher : MonoBehaviour
{
    private static HttpClient httpClient = new();
    private static Uri wineUri = new Uri("https://ipecho.net/plain");//  

    void Start()
    {
        Debug.Log("fetcher starting");
        try
        {
            string responseBody = FetchData().Result;

            Debug.Log(responseBody);
        }
        catch (HttpRequestException e)
        {
            Debug.Log("\nException Caught!");
            Debug.Log("Message :" + e.Message);
        }
    }

    static async Task<string> FetchData()
    {
        return await httpClient.GetStringAsync(wineUri);
    }

}

I do not ever see the debug log “fetcher starting”.
When I comment out the call to FetchData or replace responseBody with a string like “test”, everything proceeds and the scene loads as expected.

As soon as I involve the HttpClient, Unity hangs forever. I get no errors and have to force-quit.

Can you spot anything wrong here, or suggest how to proceed with debugging this?

Edit to add:
To make sure it isn’t something funky elsewhere in my project, I created a new 2D core project, added an empty GO and then the script above. Unity still hangs. Using 2023.3.11f1.

Can anyone confirm this behaviour, please?

2

You aren’t awaiting the result. Mark the Start method as async and add await before FetchData().Result.

2 Likes
3

Silly me.
I extracted that code from a month-old class that did a little of this and that, then suddenly stopped working even if I hadn’t changed a thing for weeks.

Your suggestions did the trick, but I’m still clueless as to why it stopped working in the first place.
meh, I guess I’ll learn to live with it. I a few years.

Thanks!

PS: I’d love to mark your reply as the answer or the thread as resolved, but I simply can’t seem to find a way to do so.

4

At the top of the page, click Thread Tools > Edit Title
Click the part that says “Question” and change it to “Resolved”

5

The compiler or IDE should actually warn you about “this call is not awaited”. Rider does that quite prominently, highlighting the statement in yellow.