从Flurl.Http v2.0.1中的请求取回cookie [英] Getting back cookies from the request in Flurl.Http v2.0.1

问题描述

使用Flurl.Http v1.2时，我们具有以下代码:

When using Flurl.Http v1.2 we had the following code:

1. var cookieJar = new CookieContainer();
2. var url = baseUrl.AppendPathSegment("api/auth/login");
3. var client = url.EnableCookies();
4. ((HttpClientHandler)client.HttpMessageHandler).CookieContainer = cookieJar;
5. var result = await client.PostJsonAsync(new { UserName = userName, Password = password });
6. var cookies = cookieJar.GetCookies(new Uri(baseUrl));
7. _cookie = cookies[0];

根据发行说明，升级到v2.0.1后，第4行不再编译，因为client不再是IFlurlClient，而现在是IFlurlRequest.

After upgrading to v2.0.1 line 4 no longer compiles because client is no longer an IFlurlClient it's now an IFlurlRequest, as per the release notes.

我注意到IFlurlRequest具有Client属性，因此我将第4行更改为:

I noticed that IFlurlRequest has a Client property, so I changed line 4 to be:

4. ((HttpClientHandler)client.Client.HttpMessageHandler).CookieContainer = cookieJar;

现在可以编译，但在运行时失败，并显示InvalidOperationException:

That now compiles but fails at run-time with an InvalidOperationException:

此实例已启动一个或多个请求.只能在发送第一个请求之前修改属性.

This instance has already started one or more requests. Properties can only be modified before sending the first request.

我假设这是由于底层HttpClient的主动重用.我在3到4之间添加了一行，以每次创建一个新的FlurlClient来确保实例无法启动请求.

I'm assuming that's because of the aggressive reuse of the underlying HttpClient. I added a line between 3 and 4 to create a new FlurlClient each time to ensure the instance could not have started a request.

1. var cookieJar = new CookieContainer();
2. var url = baseUrl.AppendPathSegment("api/auth/login");
3. var request = url.EnableCookies();
3.5 request.Client = new FlurlClient();
4. ((HttpClientHandler)request.Client.HttpMessageHandler).CookieContainer = cookieJar;
5. var result = client.PostJsonAsync(new { UserName = userName, Password = password }).Result;
6. var cookies = cookieJar.GetCookies(new Uri(baseUrl));
7. _cookie = cookies[0];

现在可以再次使用，但是我不确定我是否以正确的方式进行操作.任何反馈将不胜感激.

This now works again, but I'm not sure I'm doing this the correct way. Any feedback would be appreciated.

推荐答案

您不需要显式管理CookieContainer； Flurl使使用Cookie的工作变得简单得多.

You shouldn't need to manage CookieContainer explicitly; Flurl makes working with cookies a lot simpler.

通常，您希望尽可能多地重用HttpClient实例，默认情况下，当您不显式创建FlurlClient时，2.0会为您执行此操作，但是如果在多个调用中保留cookie，可能要自己管理FlurlClient，否则多个线程可能正在同一集合上读取/写入cookie.

Generally you want to reuse HttpClient instances as much as possible, and 2.0 does do this for you by default when you don't create FlurlClients explicitly, but in the case of persisting cookies over multiple calls you're probably going to want to manage FlurlClient yourself, otherwise multiple threads could be reading/writing cookies on the same collection.

仍然很容易.我认为您的整个示例可以简化为:

Still pretty easy. I think your whole example can be reduced to this:

using (var cli = new FlurlClient(baseUrl).EnableCookies()) {
    await cli.Request("api/auth/login").PostJsonAsync(new {
        UserName = userName,
        Password = password });
    _cookie = cli.Cookies.First().Value;
}

这篇关于从Flurl.Http v2.0.1中的请求取回cookie的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！