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Posts Tagged ‘HTTP’

Eclipse: Configure HTTP Proxy Settings for All Run Configurations

Posted by Anton Khitrenovich on August 13, 2015

There are many cases nowadays when you have to go through HTTP proxy in order to access the internet. Eclipse provides an option to configure HTTP proxy settings – either by manual configuration or loading native system settings. (It does not support auto-configuration scripts, though, so if this is the way you configure your OS, you’ll have to provide proxy address to Eclipse manually.)

However. the settings configured via Eclipse preferences are not propagated to the Java programs that you develop. Obviously, you can provide proxy settings via VM arguments, but doing that for each and every run configuration may be painful. Fortunately, this can be solved with the help of “Default VM Arguments” setting under JRE/JDK definition. System properties configured there will be in effect for every Java program you are going to run or debug. Read the rest of this entry »

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Summary of Cache-Related HTTP Headers

Posted by Anton Khitrenovich on March 11, 2015

Long ago (long before the first post in this blog!) I’ve composed a list of cache-related HTTP headers, so I would not need to go through the trial-and-error process of guessing the right combination more than once. Recently I got another question about caching and it took me a lot of time to recall where I saw this list last time. So now I’m placing it here.

Please treat the explanations below as quick and incomplete summary. For full specification of “Pragma”, “Cache-Control” and “Expires” headers refer to HTTP/1.1 specification.

Caching in HTTP 1.1

Following directive does not prevent caching despite its name. It allows caching of the page, but specifies that the cache must ask the originating web server if the page is up-to-date before serving the cached version. So the cached page can still be served up if the originating web server says so. Applies to all caches.

Cache-Control: no-cache

Following directive tells the browser that the page has expired and must be treated as stale. Should be good news as long as the caches obey.

Expires: Thu, 01 Jan 1970 00:00:00 GMT

Following directive specifies that the page contains information intended for a single user only and must not be cached by a shared cache (e.g. a proxy server).

Cache-Control: private

Following directive specifies that a cache must not store any part of the response or the request that elicited it.

Cache-Control: no-store

Following directive tells the cache that the maximum acceptable staleness of a page is 0 seconds.

Cache-Control: max-stale=0

Caching in HTTP 1.0

Following directive is the only cache control directive for HTTP 1.0, so use it in addition to any HTTP 1.1 cache control headers you include.

Pragma: no-cache

Read the rest of this entry »

Posted in HOWTO, Miscellaneous | Tagged: , | Leave a Comment »