将 HTML 文件加载到输出流

Question

I'm currently attempting to make a proxy server. The part I'm working on at the moment is to blocked certain URLs.

I created a basic HTML page that should show up whenever a blocked URL is entered but it's not currently working.

Here is the code for that section of my server.

Scanner scanner = new Scanner( new File("filePath") );
String htmlString = scanner.useDelimiter("\\Z").next();
scanner.close();
byte htmlBytes[] = htmlString.getBytes("UTF-8");
toClient.write(htmlBytes);

toClient is the output stream of my browser ie

client = mySocket.accept();
OutputStream toClient = client.getOutputStream();

Any help appreciated, thanks.

Answer 1

The response must contain the header information as below.

OutputStream clientOutput = client.getOutputStream();

clientOutput.write("HTTP/1.1 200 OK\r\n".getBytes());
clientOutput.write(("ContentType: text/html\r\n").getBytes());
clientOutput.write("\r\n".getBytes());

Scanner scanner = new Scanner(new File("server.html"));
String htmlString = scanner.useDelimiter("\\Z").next();
scanner.close();
clientOutput.write(htmlString.getBytes("UTF-8"));

clientOutput.write("\r\n\r\n".getBytes());
clientOutput.flush();

Answer 2

As the comments already mentioned you need to send the HTTP headers first. Google them or if you want to do some "research" by yourself use Wireshark and capture your network data when visiting a website.