CodeMirror.defineMode("http", function() {
  function failFirstLine(stream, state) {
    stream.skipToEnd();
    state.cur = header;
    return "error";
  }

  function start(stream, state) {
    if (stream.match(/^HTTP\/\d\.\d/)) {
      state.cur = responseStatusCode;
      return "keyword";
    } else if (stream.match(/^[A-Z]+/) && /[ \t]/.test(stream.peek())) {
      state.cur = requestPath;
      return "keyword";
    } else {
      return failFirstLine(stream, state);
    }
  }

  function responseStatusCode(stream, state) {
    var code = stream.match(/^\d+/);
    if (!code) return failFirstLine(stream, state);

    state.cur = responseStatusText;
    var status = Number(code[0]);
    if (status >= 100 && status < 200) {
      return "positive informational";
    } else if (status >= 200 && status < 300) {
      return "positive success";
    } else if (status >= 300 && status < 400) {
      return "positive redirect";
    } else if (status >= 400 && status < 500) {
      return "negative client-error";
    } else if (status >= 500 && status < 600) {
      return "negative server-error";
    } else {
      return "error";
    }
  }

  function responseStatusText(stream, state) {
    stream.skipToEnd();
    state.cur = header;
    return null;
  }

  function requestPath(stream, state) {
    stream.eatWhile(/\S/);
    state.cur = requestProtocol;
    return "string-2";
  }

  function requestProtocol(stream, state) {
    if (stream.match(/^HTTP\/\d\.\d$/)) {
      state.cur = header;
      return "keyword";
    } else {
      return failFirstLine(stream, state);
    }
  }

  function header(stream) {
    if (stream.sol() && !stream.eat(/[ \t]/)) {
      if (stream.match(/^.*?:/)) {
        return "atom";
      } else {
        stream.skipToEnd();
        return "error";
      }
    } else {
      stream.skipToEnd();
      return "string";
    }
  }

  function body(stream) {
    stream.skipToEnd();
    return null;
  }

  return {
    token: function(stream, state) {
      var cur = state.cur;
      if (cur != header && cur != body && stream.eatSpace()) return null;
      return cur(stream, state);
    },

    blankLine: function(state) {
      state.cur = body;
    },

    startState: function() {
      return {cur: start};
    }
  };
});

CodeMirror.defineMIME("message/http", "http");