HTTP response header access in curl

From: Daniel Stenberg via curl-users <curl-users_at_lists.haxx.se>
Date: Thu, 17 Mar 2022 22:43:17 +0100 (CET)

# HTTP response header access in curl

This support depends on the new headers API work coming in PR 8593. Hopefully
landing in 7.83.0.

This new header output is done with -w and new magic added to its abilties.

This is how it works right now. I'm showing it off early here because I like
it and it gives everyone a chance to voice opinions about the approach.

## Output individual header contents

Say hello to %header{name} where name is the case insensitive name of the
header withon colon.

$ curl -w '%header{date}\n' curl.se
Thu, 17 Mar 2022 16:59:24 GMT hello

## Output all response headers as JSON

Say hello to %{header_json}

$ curl -sw '%{header_json}\n' curl.se | jq
{
   "Server": "Varnish",
   "Retry-After": "0",
   "Location": "https://curl.se/",
   "Content-Length": "0",
   "Accept-Ranges": "bytes",
   "Date": "Thu, 17 Mar 2022 17:01:38 GMT",
   "Via": "1.1 varnish",
   "Connection": "close",
   "X-Served-By": "cache-bma1667-BMA",
   "X-Cache": "HIT",
   "X-Cache-Hits": "0",
   "X-Timer": "S1647536498.479515,VS0,VE0"
}

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Received on 2022-03-17