curl

Setup

2 ways:

• curl configuration file ~/.curlrc for each call;
• environment variable for a single call.

Proxy

You can disable proxy with --noproxy

curl --noproxy '*' http://www.stackoverflow.com

.curlrc

proxy = 1.2.3.4
noproxy = .dev,localhost,127.0.0.1

Send a query

Reference

Send a PUT request (when a GET, omit --request)

curl --request PUT "http://localhost:3001/rnipp/person" 

To get response code, add --show-headers.

To send a JSON in payload, use --data.

curl \
  --header "Content-Type: application/json" \
  --request PUT \
  --data '{"username":"xyz","password":"xyz"}' \
  $URL

In next version, you will use --json to omit --header option.

Failure

curl tries any query just one time, but you can ask him to keep trying.

Parameters:

• retry: how much "times" he should try
• retry-delay : rest time between tries
• retry-max-time : ceiling time

Reference

most operations in curl have no time-out by default

Parameters:

• connect-timeout : to connect
• max-time : to complete (will fail even if query is going on successfully)

https://everything.curl.dev/usingcurl/timeouts.html

write

write-out

Output response code and time elapsed

--write-out "%{http_code} - %{time_total}\n"

variables