我有两个urls:https://pcr.apple.com/id868222886和https://jigsaw.w3.org/HTTP/300/302.html。两者都有位置链接和302响应代码。
using System;
using System.IO;
using System.Net.Http;
namespace XaveScor.PodcastFeed
{
public class RemoteFeedSource: FeedSource
{
private string url;
protected virtual HttpMessageHandler Handler => new HttpClientHandler() { AllowAutoRedirect = true };
public override Stream Stream => client.Value.GetStreamAsync(url).Result;
private readonly Lazy<HttpClient> client;
public RemoteFeedSource(string url)
{
client = new Lazy<HttpClient>(() => new HttpClient(Handler), false);
this.url = url;
}
}
}
[TestMethod]
public void Test1() //fail
{
var source = new RemoteFeedSource("https://pcr.apple.com/id868222886");
Assert.AreNotEqual(source.Stream.GetString(), "");
}
[TestMethod]
public void Test2() //success
{
var source = new RemoteFeedSource("https://jigsaw.w3.org/HTTP/300/302.html");
Assert.AreNotEqual(source.Stream.GetString(), "");
}为什么?有什么不同吗?
发布于 2017-04-23 21:33:13
如果您查看响应中的标题,您将看到以下内容:
第一个(https://pcr.apple.com/id868222886):
Content-Length: 0
Location: http://beardycast.libsyn.com/rss第二个(https://jigsaw.w3.org/HTTP/300/302.html):
Content-Length: 389
Content-Type: text/html;charset=ISO-8859-1
Location: https://jigsaw.w3.org/HTTP/300/Overview.html因此,第一台服务器悄悄地重定向您,而第二台服务器为您提供了一些额外的标题:
Strict-Transport-Security: max-age=15552015; includeSubDomains; preload
Public-Key-Pins: pin-sha256="cN0QSpPIkuwpT6iP2YjEo1bEwGpH/yiUn6yhdy+HNto="; pin-sha256="WGJkyYjx1QMdMe0UqlyOKXtydPDVrk7sl2fV+nNm1r4="; pin-sha256="LrKdTxZLRTvyHM4/atX2nquX9BeHRZMCxg3cf4rhc2I="; max-age=864000
X-Frame-Options: deny
X-XSS-Protection: 1; mode=block和反应机构:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Moved</title>
</head>
<body>
<P>This resources has moved, click on the link if your browser doesn't support automatic redirection<BR>
<A HREF="http://jigsaw.w3.org/HTTP/300/Overview.html">http://jigsaw.w3.org/HTTP/300/Overview.html</A></body>
</html>这就是为什么HttpClient返回非空结果字符串的原因--它实际上不是空的。单元测试有错误的设计方法,因为它们不检查状态,而是只检查响应长度,即使对于3** http状态代码,响应长度也可能是非空的。
https://stackoverflow.com/questions/43573321
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