Dows media woithout validating

Notice that no-cache is not instructing the browser or proxies about whether or not to cache the content.It just tells the browser and proxies to validate the cache content with the server before using it (this is done by using If-Modified-Since, If-Unmodified-Since, If-Match, If-None-Match attributes mentioned above).This is Mozilla's version of the X-Do-Not-Track header field (since Firefox 4.0 Beta 11). A de facto standard for identifying the originating protocol of an HTTP request, since a reverse proxy (or a load balancer) may communicate with a web server using HTTP even if the request to the reverse proxy is HTTPS.

Many user agents show different behavior in loading pages from the history store or cache depending on whether the protocol is HTTP or HTTPS.

The HTTP/1.1 header field is also intended for use in requests made by the client.

It is a means for the browser to tell the server and any intermediate caches that it wants a fresh version of the resource.

A new Microsoft website has just made life a little easier for anyone who's ever purchased a retail copy of Windows 7.

The end of the header section is indicated by an empty field(line), resulting in the transmission of two consecutive CR-LF pairs.

In the past, long lines could be folded into multiple lines; continuation lines are indicated by the presence of a space (SP) or horizontal tab (HT) as the first character on the next line. A core set of fields is standardized by the Internet Engineering Task Force (IETF) in RFCs 7230, 7231, 7232, 7233, 7234, and 7235.

(The word “referrer” has been misspelled in the RFC as well as in most implementations to the point that it has become standard usage and is considered correct terminology)The transfer encodings the user agent is willing to accept: the same values as for the response header field Transfer-Encoding can be used, plus the "trailers" value (related to the "chunked" transfer method) to notify the server it expects to receive additional fields in the trailer after the last, zero-sized, chunk.

Only Requests a web application to disable their tracking of a user.

If your original installation DVD has been damaged or lost, you can now download the installation media in ISO format from the Microsoft Software Recovery site.

(Previously, it was possible to download Windows 7 ISO media from Microsoft's online software distribution partner, Digital River, but those links stopped working last year.) Windows 8 in Business Microsoft has painted bold design strokes with Windows 8, but the business impact remains hotly debated.

Sending a no-cache value thus instructs a browser or proxy to not use the cache contents merely based on "freshness criteria" of the cache content.

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