Java HTTP响应代码200，而应为301

Question

The following code is driving me insane. It sometimes returns the wrong response code and I do not understand why. Eg, http://www.ebay.com/itm/131709867498 returns a 301 Moved Permanently in real life (Chrome and Edge), while the following code returns 200 . Thanks a ton in advance. (In case it matters, I am running Java 1.8.0_66.)

HttpURLConnection connection = (HttpURLConnection)new URL("http://www.ebay.com/itm/131709867498").openConnection();

connection.setRequestMethod("HEAD");
connection.setInstanceFollowRedirects(false);

int statusCode = connection.getResponseCode();
System.out.println(statusCode);

Answer 1

When I run your URL in Curl I get a '200'. Why do you think it should be returning 301?

url -I "http://www.ebay.com/itm/131709867498"
HTTP/1.1 200 OK
X-EBAY-C-REQUEST-ID: ri=yGq%2BS7ChLgXP,rci=XOZjR%2BAfGDb5BkY5
RlogId: t6ulcpjqcj9%3Feog4d71f%2B66%600-15436278e5c-0x17a
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Type: text/html;charset=UTF-8
Content-Language: en-US
Content-Length: 0
Server: Server
Date: Thu, 21 Apr 2016 00:10:42 GMT
Connection: keep-alive
Set-Cookie: JSESSIONID=4694AD028535546045A4E2853D7F8B72; Path=/; HttpOnly
Set-Cookie: ebay=%5Esbf%3D%23%5E;Domain=.ebay.com;Path=/
Set-Cookie: dp1=bu1p/QEBfX0BAX19AQA**58f94e02^bl/US5ada8182^;Domain=.ebay.com;Expires=Sat, 21-Apr-2018 00:10:42 GMT;Path=/
Set-Cookie: s=CgAD4ACBXGWwCMzYyNzhlNTcxNTQwYTYyMjg3MDFkNTExZmZiN2MyMGKrI6lP;Domain=.ebay.com;Path=/; HttpOnly
Set-Cookie: nonsession=CgADLAAFXGCGKMQDKACBgfhwCMzYyNzhlNTcxNTQwYTYyMjg3MDFkNTExZmZiN2MyMGIcCAX2;Domain=.ebay.com;Expires=Fri, 21-Apr-2017 00:10:42 GMT;Path=/

Answer 2

You are using "Head" method but Browsers use "GET" method, if you change

connection.setRequestMethod("HEAD");

TO

connection.setRequestMethod("GET");

you will see 301 status code