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CURLOPT_DNS_USE_GLOBAL_CACHE: deprecated
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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@ -70,3 +70,24 @@ libcurl code.
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Left to answer: should the *setopt() function start to return error when these
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options are set to be able to tell when they're trying to use options that are
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no longer around or should we maintain behavior as much as possible?
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## CURLOPT_DNS_USE_GLOBAL_CACHE
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This option makes libcurl use a global non-thread-safe cache for DNS if
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enabled. The option has been marked as "obsolete" in the header file and in
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documentation for several years already.
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There's proper and safe method alternative provided since many years: the
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share API.
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### State
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In curl 7.62.0 setting this option to TRUE will not have any effect. The
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global cache will not be enabled. The code still remains so it is easy to
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revert if need be.
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### Removal
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Remove all global-cache related code from curl around April 2019 (might be
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7.66.0).
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@ -127,9 +127,11 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option,
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data->set.dns_cache_timeout = arg;
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break;
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case CURLOPT_DNS_USE_GLOBAL_CACHE:
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#if 0 /* deprecated */
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/* remember we want this enabled */
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arg = va_arg(param, long);
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data->set.global_dns_cache = (0 != arg) ? TRUE : FALSE;
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#endif
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break;
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case CURLOPT_SSL_CIPHER_LIST:
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/* set a list of cipher we want to use in the SSL connection */
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