set and validate http cache headers
npm install notmodified
var notmodified = ;var http = ;var startTime = ;http;
var notmodified = ;var valid = ;
requrie('notmodified') returns a function where the first two arguments
are the http
res object. The next argument (
cache) is an object
containing the cache validation data.
notmodified function returns a
valid boolean. If
client cache is valid and
res.statusCode has been set to
res.end() should stil be called.
cache object can have three optional properties:
hash this is the
ETag value and must be a string. If its not set no
header will be send. If the client sends a
if-none-match but no
value is given
valid will be
mtime is the
Last-Modified value and must be
Date object. Just as with
ETag the header will only be send if
mtime is specified and
false if the client send
If-Modified-Since but no
mtime was set.
weak this is an extension to the
ETag header and must be a boolean. If
its not set it defaults to
false. This indicated if the
byte-by-byte valid and if a
Range request makes sence. Specifically if and
ETag will be prefixed with
The software is license under "MIT"
Copyright (c) 2013 Andreas Madsen
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.