Question: HttpClientFactory custom http message handlers

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@Wolffy101 已经在做这个了。

开始于 2026年10月9日。

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调研方向

首先阅读 HttpClientFactory.CreateHandler(CreateHttpClientArgs args) 以及 issue 中展示的 IHttpMessageHandlerFactory 用法，然后检查现有的 SDK 注册和初始化流程。当多个由 DI 解析的 handler 可以在不丢失 gzip、user-agent 配置或其他 SDK 初始化器的情况下复用时，即视为完成；未指定任何文件或测试路径。

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Hello,
do you have an example, how we can extend http client factory to add multiple http message handlers and keep current implementation of google http client factory? In essence, I have multiple handlers covering cross cutting concerns (traces, metrics, logs) which I am using with other typed http clients, I would like them to be reused. Ideally it would the best to resolve them from DI.

I have found similar issue in other library which uses google http client factory ref: https://github.com/googleapis/google-api-dotnet-client/issues/1756, however some of the implementation is missing in current.

For now I have implemented as such (since I could not find any other possible way)

// configure handlers, so I could resolve through IHttpMessageHandlerFactory
builder.Services.AddHttpClient("Firebase")
    .ConfigurePrimaryHttpMessageHandler(_ => // some proxy configuration)
    .AddHttpMessageHandler<CorrelationIdHandler>()
    .AddHttpMessageHandler<LoggingHandler>()
    .AddHttpMessageHandler<TracingHandler>();


// override google http client factory
public class FirebaseHttpClientFactory : HttpClientFactory
{
      private readonly IHttpMessageHandlerFactory _httpMessageHandlerFactory;

      public FirebaseHttpClientFactory(IHttpMessageHandlerFactory httpMessageHandlerFactory)
      {
             _httpMessageHandlerFactory = httpMessageHandlerFactory
      }

      protected override HttpMessageHandler CreateHandler(CreateHttpClientArgs args)
      {
             return _httpMessageHandlerFactory.CreateHandler("Firebase");
      }
}


// register firebase messaging 
builder.Services.AddSingleton(sp =>  return FirebaseMessaging.GetMessaging(FirebaseApp.Create(new AppOptions{
     Credential = // load from file
     HttpClientFactory = new FirebaseHttpClientFactory(sp.GetRequiredService<IHttpMessageHandlerFactory>())
}));

By doing this, it kinda works, however I loose a lot of functionality from SDK itself, like gzip, user agent name setter and other initializers.

Can you please confirm that this is the only way currently how to achieve this and whether this will work?

I can see that other google library ref: https://github.com/googleapis/google-api-dotnet-client/issues/1756 already decoupled itself from accepting implementation of google.HttpClientFactory to interface (what let's to use DI and pass multiple handlers).

Are you planning to make similar update to this library? If yes and you need help, please let me know :)

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