request-caching

An HTTP client with caching, built on top of request. It works as a drop-in replacement for request. All that is needed is to pass a cache option:

Features

• Drop-in replacement for request
• Memory or Redis backed cache
• Takes advantage of ETag by using If-None-Match
• Supports both public and private caching

Example

var LRU = require('lru-cache');
var public_lru = new LRU();
var private_lru = new LRU();
var cache = new MemoryCache(public_lru, private_lru);
request('http://some.url', {cache: cache}, function(err, res, body) {
  
});

The cache object must be an object with the following methods:

• add(key, private, val, function(err){})
• get(key, function(err, val){})

How it works

• All cacheable responses are cached, even if they are expired.
• Nothing is ever removed from the cache.
• If a cached response is not expired, returns it
• If a cached response is expired, issue request with If-None-Match value from cached response's ETag. If response is 304 (Not Modified), returned cached response.
  • TODO: re-cache with updated expiry date?
• Cacheable responses marked as private are added to a private cache
• Cache lookups look in private cache first, and then in the public cache.