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Issue with Memory Leak in .NET 6 Console App Using HttpClient for Bulk API Calls

πŸ‘€ Views: 89 πŸ’¬ Answers: 1 πŸ“… Created: 2025-06-11
c# .net httpclient memory-leak C#

I need help solving After trying multiple solutions online, I still can't figure this out..... After trying multiple solutions online, I still can't figure this out. I'm experiencing a memory leak in my .NET 6 console application that uses `HttpClient` to make bulk API calls. The application runs fine initially, but over time, the memory usage keeps increasing, and I eventually encounter an `OutOfMemoryException`. I've implemented my API calls using a `Task.WhenAll` approach to handle multiple requests asynchronously, but I'm unsure if this is causing the leak. Here’s a simplified version of my code: ```csharp using System; using System.Collections.Generic; using System.Net.Http; using System.Threading.Tasks; class Program { private static readonly HttpClient _httpClient = new HttpClient(); static async Task Main(string[] args) { List<string> urls = new List<string> { "https://api.example.com/data1", "https://api.example.com/data2", "https://api.example.com/data3" }; await FetchData(urls); } static async Task FetchData(List<string> urls) { var tasks = new List<Task<string>>(); foreach (var url in urls) { tasks.Add(_httpClient.GetStringAsync(url)); } // Waiting for all tasks to complete string[] results = await Task.WhenAll(tasks); Console.WriteLine("Fetched data successfully!"); } } ``` I've read that `HttpClient` is intended to be reused and should not be instantiated per request, which is why I’m using a static readonly instance. However, I also tried disposing of the `HttpClient` after the requests in case it was causing the leak, but that led to `ObjectDisposedException` when trying to reuse it. I’ve checked for potential references that might prevent garbage collection, but I’m not sure where the leak is originating. Is there a better pattern I should be using for making these bulk calls? Any suggestions on how to identify and fix the memory leak would be greatly appreciated. I'm working on a application that needs to handle this. This issue appeared after updating to C# LTS. Thanks for any help you can provide!