Java HTTP/HTTPS 客户端，HTTPS 请求上的“连接重置”
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/28910223/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
HTTP/HTTPS client, "connection reset" on HTTPS requests
提问by iamprem
I'm trying to make a simple HTTP/HTTPS client using java. What i have done as of now in my Client.java file is here.
我正在尝试使用 java制作一个简单的HTTP/HTTPS 客户端。到目前为止，我在 Client.java 文件中所做的工作就在这里。
Everything is working good when i try to access www.google.com:80. I'm getting the full HTML content in my response BufferedReader.
当我尝试访问 www.google.com:80 时，一切正常。我在响应 BufferedReader 中获得了完整的 HTML 内容。
But, when i try to access www.google.com:443, there is no data coming through BufferedReader
但是，当我尝试访问 www.google.com:443 时，没有数据通过 BufferedReader
For www.facebook.com:80,
对于 www.facebook.com:80，
HTTP/1.1 302 Found
Also, when i try with www.facebook.com:443, Getting the following error:
另外，当我尝试使用 www.facebook.com:443 时，出现以下错误：
Exception in thread "main" java.net.SocketException: Connection reset
Where am i going wrong? Why am i not able to get any response for the HTTPS sites?
我哪里出错了？为什么我无法获得 HTTPS 站点的任何响应？
public class Client {
public static void main(String[] args) throws IOException {
//String host = args[0];
//int port = Integer.parseInt(args[1]);
//String path = args[2];
int port = 80;
String host = "www.google.com";
String path = "/";
//Opening Connection
Socket clientSocket = new Socket(host, port);
System.out.println("======================================");
System.out.println("Connected");
System.out.println("======================================");
//Declare a writer to this url
PrintWriter request = new PrintWriter(clientSocket.getOutputStream(),true);
//Declare a listener to this url
BufferedReader response = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
//Sending request to the server
//Building HTTP request header
request.print("GET "+path+" HTTP/1.1\r\n"); //"+path+"
request.print("Host: "+host+"\r\n");
request.print("Connection: close\r\n");
request.print("\r\n");
request.flush();
System.out.println("Request Sent!");
System.out.println("======================================");
//Receiving response from server
String responseLine;
while ((responseLine = response.readLine()) != null) {
System.out.println(responseLine);
}
System.out.println("======================================");
System.out.println("Response Recieved!!");
System.out.println("======================================");
request.close();
response.close();
clientSocket.close();
}
}
采纳答案by Jason C
HTTPS is encrypted; it's HTTP via SSL. You can't just send raw HTTP requests. The server will drop your connection immediately if you start sending data without establishing a secure connection first (hence the connection reset error). You have to establish an SSL connection first. You'd want to use an SSLSocket(via SSLSocketFactory, see also example) instead of a Socketin that case.
HTTPS 是加密的；它是通过 SSL 的 HTTP。您不能只发送原始 HTTP 请求。如果您在没有先建立安全连接的情况下开始发送数据（因此出现连接重置错误），服务器将立即断开您的连接。您必须先建立 SSL 连接。在这种情况下，您可能希望使用SSLSocket(via SSLSocketFactory，另见示例) 而不是 a Socket。
It's as simple as changing one line of your code for the HTTPS case (well, three if you count the exception specification and the port number change to 443):
就像为 HTTPS 情况更改一行代码一样简单（好吧，如果算上异常规范并且端口号更改为 443，则为三行）：
Socket clientSocket = SSLSocketFactory.getDefault().createSocket(host, port);
Note that clientSocketwill be an instance of SSLSocket(which is derived from Socket) in this case.
请注意，在这种情况下，clientSocket将是SSLSocket（源自Socket）的实例。
However, if you're doing this as part of a larger application (as opposed to just a learning experience), consider existing libraries, such as Apache's HttpClient(which supports HTTPS as well) or the built-in HttpURLConnectionand HttpsURLConnectionif you need something more basic. If you need to embed a server in an application you can use the built-in HttpServeror HttpsServer.
但是，如果你这样做是为更大的应用程序（而不仅仅是一个学习的经验）的一部分，考虑现有库，比如Apache的HttpClient（支持HTTPS以及）或内置的HttpURLConnection和HttpsURLConnection如果你需要更多的东西基本. 如果您需要在应用程序中嵌入服务器，您可以使用内置的HttpServer或HttpsServer.
Also issues that EJP mentioned in his comment.
还有 EJP 在他的评论中提到的问题。
