是否可以在OWIN TestServer中使用Furl.Http?

问题描述

我正在使用OWIN TestServer，它为我提供了一个HttpClient来执行对测试服务器的内存调用.我想知道是否有一种方法可以传入现有的HttpClient供Flurl使用.

I'm using the OWIN TestServer which provides me an HttpClient to do my in memory calls to the test server. I'm wondering if there's a way of passing in the existing HttpClient for Flurl to use.

推荐答案

更新: 以下大部分信息在Flurl.Http 2.x中不再相关.具体来说，Flurr的大多数功能都包含在新的FlurlClient对象(用于包装HttpClient)中，而不包含在自定义消息处理程序中，因此，如果您提供不同的HttpClient，则不会失去功能.此外，从Flurl.Http 2.3.1开始，您不再需要自定义工厂来执行此操作.就像这样简单:

UPDATE: Much of the information below is no longer relevant in Flurl.Http 2.x. Specifically, most of Flurl's functionality is contained in the new FlurlClient object (which wraps HttpClient) and not in a custom message handler, so you're not losing functionality if you provide a different HttpClient. Further, as of Flurl.Http 2.3.1, you no longer need a custom factory to do this. It's as easy as:

var flurlClient = new FlurlClient(httpClient);

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Flurl提供了一个IHttpClientFactory界面，允许您自定义HttpClient构造.但是，Flurl的许多功能是由自定义HttpMessageHandler提供的，该自定义HttpMessageHandler在构造时已添加到HttpClient中.您不希望为已实例化的HttpClient热插拔它，否则将有可能破坏Flurl.

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Flurl provides an IHttpClientFactory interface that allows you to customize HttpClient construction. However, much of Flurl's functionality is provided by a custom HttpMessageHandler, which is added to HttpClient on construction. You wouldn't want to hot-swap it out for an already instantiated HttpClient or you'll risk breaking Flurl.

幸运的是，OWIN TestServer也是由HttpMessageHandler驱动的，创建HttpClient时可以流水线化多个对象.

Fortunately, OWIN TestServer is also driven by an HttpMessageHandler, and you can pipeline multiple when you create an HttpClient.

从允许您传入TestServer实例的自定义工厂开始:

Start with a custom factory that allows you to pass in the TestServer instance:

using Flurl.Http.Configuration;
using Microsoft.Owin.Testing;

public class OwinTestHttpClientFactory : DefaultHttpClientFactory
{
    private readonly TestServer _testServer;

    public OwinTestHttpClientFactory(TestServer server) {
        _testServer = server;
    }

    public override HttpMessageHandler CreateMessageHandler() {
        // TestServer's HttpMessageHandler will be added to the end of the pipeline
        return _testServer.Handler;
    }
}

可以在全球范围内注册工厂，但是由于每个测试都需要一个不同的TestServer实例，因此建议将其设置在FlurlClient实例上，该实例为新功能.因此您的测试将如下所示:

Factories can be registered globally, but since you need a different TestServer instance for each test, I'd recommend setting it on the FlurlClient instance, which is a new capability as of Flurl.Http 0.7. So your tests would look something like this:

using (var testServer = TestServer.Create(...)) {
    using (var flurlClient = new FlurlClient()) {
        flurlClient.Settings.HttpClientFactory = new OwinTestHttpClientFactory(testServer);

        // do your tests with the FlurlClient instance. 2 ways to do that:
        url.WithClient(flurlClient).PostJsonAsync(...);
        flurlClient.WithUrl(url).PostJsonAsync(...);
    }
}

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