fix: don't cache server name lookups indefinitely

Matthias Ahouansourequested to merge
finite-servername-cache into next

Ideally we would just use the CacheControl header from the headers crate, but I couldn't seem to find a way to serialize it's value from a reqwest::Response easily. We now use decode() on the header map to extract the CacheControl value.

  • Tested, confirmed working as expected
  • I agree to release my code and all other changes of this MR under the Apache-2.0 license
Edited by Matthias Ahouansou

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