text: function handleRequest(request, response)
  {
    try {
      reallyHandleRequest(request, response);
    } catch (e) {
      response.setStatusLine("1.0", 200, "AlmostOK");
      response.write("Error handling request: " + e);
    }
  }
  
  
  function reallyHandleRequest(request, response) {
    var match;
    var requestAuth = true, requestProxyAuth = true;
  
    // Allow the caller to drive how authentication is processed via the query.
    // Eg, http://localhost:8888/authenticate.sjs?user=foo&realm=bar
    // The extra ? allows the user/pass/realm checks to succeed if the name is
    // at the beginning of the query string.
    var query = "?" + request.queryString;
  
    var expected_user = "", expected_pass = "", realm = "mochitest";
    var proxy_expected_user = "", proxy_expected_pass = "", proxy_realm = "mochi-proxy";
    var huge = false, plugin = false, anonymous = false, formauth = false;
    var authHeaderCount = 1;
    // user=xxx
    match = /[^_]user=([^&]*)/.exec(query);
    if (match)
      expected_user = match[1];
  
    // pass=xxx
    match = /[^_]pass=([^&]*)/.exec(query);
    if (match)
      expected_pass = match[1];
  
    // realm=xxx
    match = /[^_]realm=([^&]*)/.exec(query);
    if (match)
      realm = match[1];
  
    // proxy_user=xxx
    match = /proxy_user=([^&]*)/.exec(query);
    if (match)
      proxy_expected_user = match[1];
  
    // proxy_pass=xxx
    match = /proxy_pass=([^&]*)/.exec(query);
    if (match)
      proxy_expected_pass = match[1];
  
    // proxy_realm=xxx
    match = /proxy_realm=([^&]*)/.exec(query);
    if (match)
      proxy_realm = match[1];
  
    // huge=1
    match = /huge=1/.exec(query);
    if (match)
      huge = true;
  
    // plugin=1
    match = /plugin=1/.exec(query);
    if (match)
      plugin = true;
  
    // multiple=1
    match = /multiple=([^&]*)/.exec(query);
    if (match)
      authHeaderCount = match[1]+0;
  
    // anonymous=1
    match = /anonymous=1/.exec(query);
    if (match)
      anonymous = true;
  
    // formauth=1
    match = /formauth=1/.exec(query);
    if (match)
      formauth = true;
  
    // Look for an authentication header, if any, in the request.
    //
    // EG: Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==
    // 
    // This test only supports Basic auth. The value sent by the client is
    // "username:password", obscured with base64 encoding.
  
    var actual_user = "", actual_pass = "", authHeader, authPresent = false;
    if (request.hasHeader("Authorization")) {
      authPresent = true;
      authHeader = request.getHeader("Authorization");
      match = /Basic (.+)/.exec(authHeader);
      if (match.length != 2)
          throw new Error("Couldn't parse auth header: " + authHeader);
  
      var userpass = base64ToString(match[1]); // no atob() :-(
      match = /(.*):(.*)/.exec(userpass);
      if (match.length != 3)
          throw new Error("Couldn't decode auth header: " + userpass);
      actual_user = match[1];
      actual_pass = match[2];
    } 
  
    var proxy_actual_user = "", proxy_actual_pass = "";
    if (request.hasHeader("Proxy-Authorization")) {
      authHeader = request.getHeader("Proxy-Authorization");
      match = /Basic (.+)/.exec(authHeader);
      if (match.length != 2)
          throw new Error("Couldn't parse auth header: " + authHeader);
  
      var userpass = base64ToString(match[1]); // no atob() :-(
      match = /(.*):(.*)/.exec(userpass);
      if (match.length != 3)
          throw new Error("Couldn't decode auth header: " + userpass);
      proxy_actual_user = match[1];
      proxy_actual_pass = match[2];
    }
  
    // Don't request authentication if the credentials we got were what we
    // expected.
    if (expected_user == actual_user &&
      expected_pass == actual_pass) {
      requestAuth = false;
    }
    if (proxy_expected_user == proxy_actual_user &&
      proxy_expected_pass == proxy_actual_pass) {
      requestProxyAuth = false;
    }
  
    if (anonymous) {
      if (authPresent) {
        response.setStatusLine("1.0", 400, "Unexpected authorization header found");
      } else {
        response.setStatusLine("1.0", 200, "Authorization header not found");
      }
    } else {
      if (requestProxyAuth) {
        response.setStatusLine("1.0", 407, "Proxy authentication required");
        for (i = 0; i < authHeaderCount; ++i)
          response.setHeader("Proxy-Authenticate", "basic realm=\"" + proxy_realm + "\"", true);
      } else if (requestAuth) {
        if (formauth && authPresent)
          response.setStatusLine("1.0", 403, "Form authentication required");
        else
          response.setStatusLine("1.0", 401, "Authentication required");
        for (i = 0; i < authHeaderCount; ++i)
          response.setHeader("WWW-Authenticate", "basic realm=\"" + realm + "\"", true);
      } else {
        response.setStatusLine("1.0", 200, "OK");
      }
    }
  
    response.setHeader("Content-Type", "application/xhtml+xml", false);
    response.write("<html xmlns='http://www.w3.org/1999/xhtml'>");
    response.write("<p>Login: <span id='ok'>" + (requestAuth ? "FAIL" : "PASS") + "</span></p>\n");
    response.write("<p>Proxy: <span id='proxy'>" + (requestProxyAuth ? "FAIL" : "PASS") + "</span></p>\n");
    response.write("<p>Auth: <span id='auth'>" + authHeader + "</span></p>\n");
    response.write("<p>User: <span id='user'>" + actual_user + "</span></p>\n");
    response.write("<p>Pass: <span id='pass'>" + actual_pass + "</span></p>\n");
  
    if (huge) {
      response.write("<div style='display: none'>");
      for (i = 0; i < 100000; i++) {
        response.write("123456789\n");
      }
      response.write("</div>");
      response.write("<span id='footnote'>This is a footnote after the huge content fill</span>");
    }
  
    if (plugin) {
      response.write("<embed id='embedtest' style='width: 400px; height: 100px;' " + 
             "type='application/x-test'></embed>\n");
    }
  
    response.write("</html>");
  }
  
  
  // base64 decoder
  //
  // Yoinked from extensions/xml-rpc/src/nsXmlRpcClient.js because btoa()
  // doesn't seem to exist. :-(
  /* Convert Base64 data to a string */
  const toBinaryTable = [
      -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
      -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
      -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
      52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1,
      -1, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
      15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
      -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
      41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
  ];
  const base64Pad = '=';
  
  function base64ToString(data) {
  
      var result = '';
      var leftbits = 0; // number of bits decoded, but yet to be appended
      var leftdata = 0; // bits decoded, but yet to be appended
  
      // Convert one by one.
      for (var i = 0; i < data.length; i++) {
          var c = toBinaryTable[data.charCodeAt(i) & 0x7f];
          var padding = (data[i] == base64Pad);
          // Skip illegal characters and whitespace
          if (c == -1) continue;
          
          // Collect data into leftdata, update bitcount
          leftdata = (leftdata << 6) | c;
          leftbits += 6;
  
          // If we have 8 or more bits, append 8 bits to the result
          if (leftbits >= 8) {
              leftbits -= 8;
              // Append if not padding.
              if (!padding)
                  result += String.fromCharCode((leftdata >> leftbits) & 0xff);
              leftdata &= (1 << leftbits) - 1;
          }
      }
  
      // If there are any bits left, the base64 string was corrupted
      if (leftbits)
          throw Components.Exception('Corrupted base64 string');
  
      return result;
  }
  