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:
hashthis is the
ETagvalue and must be a string. If its not set no
ETagheader will be send. If the client sends a
hashvalue is given
Last-Modifiedvalue and must be
Dateobject. Just as with the
ETagthe header will only be send if
mtimeis specified and
falseif the client send
weakthis is an extension to the
ETagheader and must be a boolean. If its not set it defaults to
false. This indicated if the
ETagis byte-by-byte valid and if a
Rangerequest makes sence. Specifically if and only if
ETagwill 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.