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doc: clarify setServer method #21469

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doc: clarify setServer method
Shivang44 Jun 22, 2018
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doc: Update dns.md to be under 80 lines
Shivang44 Jun 22, 2018
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doc: Update dns.md to expand on setServers
Shivang44 Jun 22, 2018
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doc: Update dns.md to reflect style guide
Shivang44 Jun 22, 2018
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doc: clarify setServer method 
Added a note that that clarifies the fact that setServer does not
check subsequent servers when the first one produces a NOTFOUND
error.
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@Shivang44
Shivang44 committed Jun 22, 2018
commit 0600ad44f3969377b07e32842e5a77f0b3d66c62
2 changes: 2 additions & 0 deletions doc/api/dns.md
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Expand Up @@ -1010,6 +1010,8 @@ An error will be thrown if an invalid address is provided.
The `dnsPromises.setServers()` method must not be called while a DNS query is in
progress.

Note that this method works much like [resolve.conf in Linux](http://man7.org/linux/man-pages/man5/resolv.conf.5.html). That is, if attempting to resolve with the first server provided results in a `NOTFOUND` error, the `resolve` method will *not* attempt to resolve with subsequent servers provided. Fallback DNS servers will only be used if the earlier ones time out or result in some other error.

@jasnell jasnell Jun 22, 2018

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nit: line wrap at <= 80 chars


## Error codes

Each DNS query can return one of the following error codes:
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