title: HttpRequest in Java: Always goes to 404
body: <p>I wrote this HttpRequest method, but for some reason it always goes to 404 Not Found, even though the file location exists when the java process isn't running.</p>
  
  <pre><code>import java.io.*;
  import java.net.*;
  import java.util.*;
  
  final class HttpRequest implements Runnable {
      final static String CRLF = "\r\n";
      Socket socket;
  
      // Constructor
      public HttpRequest(Socket socket) throws Exception {
          this.socket = socket;
      }
  
      // Implement the run() method of the Runnable interface.
      public void run() {
          try {
              processRequest();
          } catch (Exception e) {
              System.out.println(e);
          }
      }
  
      private static void sendBytes(FileInputStream fis, OutputStream os) 
      throws Exception {
      // Construct a 1K buffer to hold bytes on their way to the socket.
      byte[] buffer = new byte[1024];
      int bytes = 0;
  
      // Copy requested file into the socket's output stream.
      while((bytes = fis.read(buffer)) != -1 ) {
          os.write(buffer, 0, bytes);
          }
      }
  
      private static String contentType(String fileName) {
      if(fileName.endsWith(".htm") || fileName.endsWith(".html")) {
          return "text/html";
      }
      if(fileName.endsWith(".jpeg") || fileName.endsWith(".jpg")) {
      return "image/jpeg";
      }
      if(fileName.endsWith(".gif")) {
      return "image/gif";
      }
      return "application/octet-stream";
      }
  
      private void processRequest() throws Exception {
          // Get a reference to the socket's input and output streams.
          InputStream is = socket.getInputStream();
          DataOutputStream os = new DataOutputStream(socket.getOutputStream());
  
          // Set up input stream filters.
          BufferedReader br = new BufferedReader(new InputStreamReader(is));
  
          // Get the request line of the HTTP request message.
          String requestLine = new String(br.readLine());
  
          // Display the request line.
          System.out.println();
          System.out.println(requestLine);
  
          // Get and display the header lines.
          String headerLine = null;
          while ((headerLine = br.readLine()).length() != 0) {
              System.out.println(headerLine);
          }
  
      // Extract the filename from the request line.
      StringTokenizer tokens = new StringTokenizer(requestLine);
      tokens.nextToken(); // skip over the method, which should be "GET"
      String fileName = tokens.nextToken();
      // Prepend a "." so that file request is within the current directory.
      fileName = "." + fileName;
  
      // Open the requested file.
      FileInputStream fis = null;
      boolean fileExists = true;
      try {
      fis = new FileInputStream(fileName);
      } catch (FileNotFoundException e) {
      fileExists = false;
      }
  
      // Construct the response message.
      String statusLine = null;
      String contentTypeLine = null;
      String entityBody = null;
      if (fileExists) {
      statusLine = "200 OK" + CRLF;
      contentTypeLine = "Content-type: " + 
          contentType( fileName ) + CRLF;
      } else {
      statusLine = "404 NOT FOUND" + CRLF;
      contentTypeLine = "Content Not Found!" + CRLF;
      entityBody = "&lt;HTML&gt;" + 
          "&lt;HEAD&gt;&lt;TITLE&gt;Not Found&lt;/TITLE&gt;&lt;/HEAD&gt;" +
          "&lt;BODY&gt;Not Found&lt;/BODY&gt;&lt;/HTML&gt;";
      }
  
      // Send the status line.
      os.writeBytes(statusLine);
  
      // Send the content type line.
      os.writeBytes(contentTypeLine);
  
      // Send a blank line to indicate the end of the header lines.
      os.writeBytes(CRLF);
  
      // Send the entity body.
      if (fileExists) {
      sendBytes(fis, os);
      fis.close();
      } else {
      os.writeBytes("File DNE: Content Not Found!");
      }
  
          // Close streams and socket.
          os.close();
          br.close();
          socket.close();
      }
  }
  </code></pre>
  
  <p>Any help would be greatly appreciated...I feel like it's something simple I'm missing.</p>