Azure Functions timeout issues when processing HTTP requests with Azure Cosmos DB
I'm performance testing and I've spent hours debugging this and After trying multiple solutions online, I still can't figure this out....... I'm migrating some code and I'm working with a timeout scenario with my Azure Function App when it processes HTTP requests that involve reading and writing data to Azure Cosmos DB..... I'm using the .NET 6 SDK and have configured the Cosmos client with a connection string similar to the following: ```csharp public static class Function1 { private static readonly CosmosClient cosmosClient = new CosmosClient("<your_connection_string>"); private static readonly Container container = cosmosClient.GetContainer("DatabaseId", "ContainerId"); [FunctionName("Function1")] public static async Task<IActionResult> Run( [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req, ILogger log) { log.LogInformation("C# HTTP trigger function processed a request."); string requestBody = await new StreamReader(req.Body).ReadToEndAsync(); // Assume JSON deserialization happens here try { // Simulating a long-running operation await Task.Delay(30000); // 30 seconds // Interacting with Cosmos DB ItemResponse<MyItem> response = await container.CreateItemAsync(myItem); return new OkObjectResult(response.Resource); } catch (CosmosException ex) { log.LogError($"Cosmos DB behavior: {ex.Message}"); return new StatusCodeResult((int)ex.StatusCode); } } } ``` I have set the function timeout to 5 minutes in the host.json file: ```json { "functionTimeout": "00:05:00" } ``` Despite this, I notice that the function sometimes still times out after 30 seconds, which is the default timeout for HTTP-triggered functions in Azure Functions. I've tried setting the timeout in the Azure portal as well but to no avail. The application runs perfectly locally, and I can see that the Cosmos DB operations succeed without issues. I suspect this could be related to how the Azure Functions runtime handles HTTP requests or possibly the configuration for Azure Functions in the portal. Has anyone encountered a similar question or know of any workarounds? Any insights would be appreciated, especially around the HTTP timeout settings or Cosmos DB integration best practices. This is happening in both development and production on Debian. Any advice would be much appreciated. This is my first time working with Csharp 3.10. I'm working in a Ubuntu 20.04 environment. What would be the recommended way to handle this? This is happening in both development and production on Ubuntu 22.04. What am I doing wrong? Any ideas what could be causing this? The stack includes Csharp and several other technologies. I'd really appreciate any guidance on this.