如何在 azure function 2.0 中获取传入 HTTP POST 请求的 URL？

Question

I want to store URL of incoming HTTP request in variable. I am using Environment.GetEnvironmentVariable("WEBSITE_HOSTNAME") but it gives the URL of my azure where azure function in hosted.

Please refer below code:

#r "Newtonsoft.Json"
#r "Microsoft.WindowsAzure.Storage"
using System.Net;
using System.Web;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Primitives;
using Newtonsoft.Json;
using Microsoft.WindowsAzure.Storage.Blob;

 public static async Task<IActionResult> Run(HttpRequest req, CloudBlockBlob outputBlob)
    {
        var requestBody = await new StreamReader(req.Body).ReadToEndAsync();
        dynamic data =  JsonConvert.DeserializeObject(requestBody);
        var referer = req.Headers["Referer"].ToString();

        data.Add("url",referer);
        //data.Add("url",Environment.GetEnvironmentVariable("WEBSITE_HOSTNAME"));
        string output = JsonConvert.SerializeObject(data);

        await outputBlob.UploadTextAsync(output);
        return new OkObjectResult("Data has been received");
    }

Actual data received as below:

{"firstname":"Sam","lastname":"Smith","email":"sam.smith@gmail.com","dob":"1990-1-1","url":"https://xxxxxx.azurewebsites.net/api/xxxx?code=xxxxx"}

Answer 1

Update 0823:

Hey, If you still don't know how to get the url. You can take a look of this:

public static async Task<IActionResult> Run(HttpRequest req, ILogger log)
{
    var referer = req.Headers["Referer"].ToString();
    log.LogInformation("Referer is "+referer);
    return new OkObjectResult($"");
}

This is the most basic code to get the url.The circle that I circled in red is the url that sent the post.If you still have some questions, please let me know.

---

if you want to get the incoming url in Azure Function httpTrigger, you can do like this:

 var referer = req.Headers["Referer"].ToString();
        log.LogInformation("Referer is "+referer);
        var host = req.Host;
        log.LogInformation("Host is " + host);

in your httptrigger,the request header have the host and the Referer,the host is the url of your httptrigger and the Referer is the url that the request comes from.

Make sure your request is not from https to http,otherwise the Referer will disappear and you can't get it. https to https or http to https is ok.

I have already try the question you ask.I send a request from a webapplication that is deployed on the Azure and send it to the httptrigger.Finally,I get the right url:

---

Answer 2

You can get the host name from the HttpRequest req object:

HostString hostString = req.Host;
string host = hostString.Host;
int? port = hostString.Port;
string fullHost = hostString.Value; 

Answer 3

在我的脑海中，我认为它会是这样的：

  var url = request.Scheme + "://" + request.Host + request.Path;

Answer 4

You can obtain the URL of the request HOST like this.

First change the HttpRequest to HttpRequestMessage and then the below two lines will give you the host.

var context = (DefaultHttpContext) req.Properties["HttpContext"];
var host = context.Request.Host;

I have added my sample app with output.

[FunctionName("Function1")]
        public async Task<HttpResponseMessage> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous,"post", Route = null)]
            HttpRequestMessage req,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            var context = (DefaultHttpContext) req.Properties["HttpContext"];
            var host = context.Request.Host;
            log.LogInformation(host.ToString());
            return req.CreateResponse(HttpStatusCode.Accepted);

        }