Azure Functions call http post inside function

Question

Is it possible to create HTTP(s) post request inside Azure Function? I am trying to create a custom webhook that is listening to one service and when triggered then its calling another service over HTTP using post.

My code looks like that:

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{

    BitbucketRequest data = await req.Content.ReadAsAsync<BitbucketRequest>();
    //DO STH WITH DATA TO GET e.g. USER STORY ID

    using(var client = new HttpClient()){
        client.BaseAddress = new Uri("https://SOME_TARGETPROCESS_URL/api/v1");
        var body = new { EntityState = new  { Id = 174 } };
        var result = await client.PostAsJsonAsync(
                       "/UserStories/7034/?resultFormat=json&access_token=MYACCESSTOKEN",
                       body);
        string resultContent = await result.Content.ReadAsStringAsync();
    }

    return req.CreateResponse<string>(HttpStatusCode.OK,"OKOK");
}

I suppose the problem is that currently HttpRequestMessage is occupying web socket and I can not create new Http Request.

Errors that I found in Exceptions details:

• The underlying connection was closed: An unexpected error occurred on a send.
• Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
• Socket Exception Error Code : 10054

Answer 1

For anyone else who lands here when searching for HttpClient in Azure functions.

https://docs.microsoft.com/en-us/azure/azure-functions/manage-connections

// Create a single, static HttpClient
private static HttpClient httpClient = new HttpClient();

public static async Task Run(string input)
{
    var response = await httpClient.GetAsync("https://example.com");
    // Rest of function
}

Answer 2

It is certainly possible and the following code block works just fine in my test function:

using(var client = new HttpClient())
{
    client.BaseAddress = new Uri("https://www.google.com");
    var result = await client.GetAsync("");
    string resultContent = await result.Content.ReadAsStringAsync();
    log.Info(resultContent);
}

It prints out HTML of google.com. POST also works: returns Error 405 (Method Not Allowed)!!1 from google.

Can it be that your callee is failing?