What does the HTTP header Pragma: Public mean?

HttpPragma

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What does the HTTP header Pragma: Public mean?

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Solution 1 - Http

According to the standard, Pragma is implementation dependent (section 14.32), except for no-cache because of its wide use. Cache-Control (section 14.9) is the proper way to control caching. This is what the standard says for a Cache-Control: public:

> Indicates that the response MAY be > cached by any cache, even if it would > normally be non-cacheable or cacheable > only within a non- shared cache.

Solution 2 - Http

Also, "Pragma: Public" is used in Google App Engine applications to enable caching of responses within its Edge Cache.

See https://stackoverflow.com/questions/3947643/details-on-google-app-engines-caching-proxy

Solution 3 - Http

Useful when you come across this error: http://trac.edgewall.org/ticket/1020. IE 8 & less seems to like to cache things when they are on a SSL server. Putting 'Pragma:public' helps with: "Internet Explorer was not able to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later"

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
Questionuser185631View Question on Stackoverflow
Solution 1 - HttpGonzaloView Answer on Stackoverflow
Solution 2 - HttpAndy DennieView Answer on Stackoverflow
Solution 3 - HttphallsuchView Answer on Stackoverflow