Strange Behavior with HttpClient in .NET 6 - Getting 404 on Cached Responses
I'm working on a personal project and I've been banging my head against this for hours. After trying multiple solutions online, I still can't figure this out. I'm working with a perplexing scenario with `HttpClient` in my .NET 6 application where I'm getting a 404 behavior for requests that should be returning cached responses. I'm using `HttpClientFactory` to create instances of `HttpClient`, and I've configured a default request header for all requests. Here’s a simplified version of my code: ```csharp public class MyService { private readonly HttpClient _httpClient; public MyService(IHttpClientFactory httpClientFactory) { _httpClient = httpClientFactory.CreateClient(); _httpClient.DefaultRequestHeaders.Add("Accept", "application/json"); } public async Task<string> GetDataAsync(string endpoint) { var response = await _httpClient.GetAsync(endpoint); response.EnsureSuccessStatusCode(); return await response.Content.ReadAsStringAsync(); } } ``` When making requests to an external API, I noticed that after the first successful request, subsequent requests to the same endpoint return a 404 behavior intermittently. I suspected this might be related to caching, so I tried adding a cache policy middleware, but that didn't resolve the scenario. I also checked the headers being sent with the requests and they seem correct. I’ve confirmed that the API endpoint is valid and returns a success response on the first try. After that, the requests seem to hit a cached state somehow, which leads to the 404 errors. I am not explicitly setting any caching headers in my `HttpClient` requests. I’m using .NET 6.0.100 with default settings for `HttpClientFactory`. Any insights on how to handle or debug this caching behavior would be greatly appreciated! Also, I’ve tried disabling caching in my browser and using Postman to confirm the API’s behavior, and it behaves as expected there. Is there something in my configuration or implementation that might be causing these cached 404s? This issue appeared after updating to C# 3.9. Is there a simpler solution I'm overlooking? This is my first time working with C# LTS. Any advice would be much appreciated.