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CURLOPT_DNS_USE_GLOBAL_CACHE: deprecated

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Disable the CURLOPT_DNS_USE_GLOBAL_CACHE option and mark it for
deprecation and complete removal in six months.

Bug: https://curl.haxx.se/mail/lib-2018-09/0010.html
Closes #2942
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Daniel Stenberg 2018-09-05 00:05:46 +02:00
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21
docs/DEPRECATE.md
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@ -70,3 +70,24 @@ libcurl code.
Left to answer: should the *setopt() function start to return error when these
options are set to be able to tell when they're trying to use options that are
no longer around or should we maintain behavior as much as possible?
## CURLOPT_DNS_USE_GLOBAL_CACHE
This option makes libcurl use a global non-thread-safe cache for DNS if
enabled. The option has been marked as "obsolete" in the header file and in
documentation for several years already.
There's proper and safe method alternative provided since many years: the
share API.
### State
In curl 7.62.0 setting this option to TRUE will not have any effect. The
global cache will not be enabled. The code still remains so it is easy to
revert if need be.
### Removal
Remove all global-cache related code from curl around April 2019 (might be
7.66.0).