TOC
Summary
HttpClient use a socket-line resource of your server. So, you don’t make many HttpClient instance. If you can share instance for HttpClient. It’s the same also Azure Functions.
Prerequisites
- .NET Core v3.1
- Azure Functions v3
- Microsoft.NET.Sdk.Functions v3.0.3
- Microsoft.Azure.Functions.Extensions v1.1.0
- Microsoft.Extension.Http v3.1.20
- Visual Studio for Mac v8.10
- Azure Functions Core Tools v3.0.3873
- C# v8
- macOS v11.6
Steps
Install Microsoft.Extension.Http via NuGet, then add builder.Services.AddHttpClient() to your code.
using System;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
[assembly: FunctionsStartup(typeof(YourNameSpace.Startup))]
namespace YourNameSpace
{
public class Startup : FunctionsStartup
{
public override void Configure(IFunctionsHostBuilder builder)
{
Console.WriteLine("hoge1");
builder.Services.AddHttpClient();
}
}
}Next, add Functions class. Example is here:
using System;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Extensions.Logging;
namespace YourNameSpace
{
public class Package
{
private readonly HttpClient _client;
public Package(IHttpClientFactory httpClientFactory)
{
this._client = httpClientFactory.CreateClient();
}
[FunctionName("packages")]
public async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", Route = null)] HttpRequest req,
ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
var response = await _client.GetAsync("https://example.com");
string responseMessage = $"Got response, http status is {response.StatusCode}";
return new OkObjectResult(responseMessage);
}
}
}
