Socket exception while making Http calls

Question

I have a blob triggered azure function (v2) hosted with App Service plan(S3). The function process a json file and makes Http calls to APIs exposed in API management service.

I'm using HttpClient to make Http calls. Although this works fine in one environment with same set up, it is failing while making http post calls in another environment.

The exception :

System.Net.Sockets.SocketException with error message "The operation was canceled. Unable to read data from the transport connection: The I/O operation has been aborted because of either a thread exit or an application request. The I/O operation has been aborted because of either a thread exit or an application request"

Quick googling revealed me that it may happen because of excess http connections. More details here :

https://learn.microsoft.com/en-us/azure/azure-functions/manage-connections#connections-limit

The solution was to use static HttpClient or scale out App service plan. I did both only to realise that it still fails with same exception.

Has any one encountered this issue?

Any insights would be helpful.

Edit: Here is the code that makes http call

public class ReportingService : IReportingService
    {
        private static readonly HttpClient _httpClient = new HttpClient();
        private readonly ILogger _logger;

        public ReportingService(ILogger logger, IConfigurationRoot configuration)
        {
            _logger = logger;
            _httpClient.BaseAddress = new Uri(configuration["ReportingServiceBaseUrl"]);
            _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.UTF8.GetBytes($"{configuration["APIUser"]}:{configuration["APIPassword"]}")));
        }

        public async Task RequestReport(string endpoint, StringContent httpContent)
        {
            try
            {
                var response = await _httpClient.PostAsync(endpoint, httpContent);
                return response.IsSuccessStatusCode;
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Migration failed");
                throw;
            }
        }
    }

Socket exception while making Http calls

Answers (1)

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