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hostip: cache negative name resolves

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Hold them for half the normal lifetime. Helps when told to transfer N
URLs in quick succession that all use the same non-resolving hostname.

Done by storing a DNS entry with a NULL pointer for 'addr'.

Previously an attempt was made in #12406 by Björn Stenberg that was
ultimately never merged.

Closes #18157
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Daniel Stenberg 2025-08-04 00:06:03 +02:00
parent 06c12cc08b
commit df2b4ccc22
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11 changed files with 155 additions and 19 deletions
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@ -24,7 +24,6 @@
1.5 get rid of PATH_MAX
1.6 thread-safe sharing
1.8 CURLOPT_RESOLVE for any port number
1.9 Cache negative name resolves
1.10 auto-detect proxy
1.11 minimize dependencies with dynamically loaded modules
1.12 updated DNS server while running
@ -263,11 +262,6 @@
See https://github.com/curl/curl/issues/1264
1.9 Cache negative name resolves
A name resolve that has failed is likely to fail when made again within a
short period of time. Currently we only cache positive responses.
1.10 auto-detect proxy
libcurl could be made to detect the system proxy setup automatically and use