bash - Curl: don't wait for response -

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• run shell command , don't wait return [duplicate] 2 answers

i have shell script relies on curl command this:

curl --request post -u name:pass -h "content-type: application/json"  --data "{data}" https://url.com --cacert ./my_crt 

i don't need response of command, , command in big loop, waiting responses take lot of time.

so, there way in bash same thing, without waiting response?

if have large number of requests want issue quickly, , don't care output, there 2 things should do:

1. do more requests same connection.

for small requests, it's faster 10 requests each on 1 connection, 1 request each on 10 connections. henry's http post test server, difference 2.5x:

$ time in {1..10};     curl -f foo=bar https://posttestserver.com/post.php ;   done dumped 1 post variables. view @ http://www.posttestserver.com/data/2016/06/09/11.44.48536583865 post body 0 chars long. (...) real    0m2.429s 

vs

$ time  {     array=();     in {1..10};       array+=(--next -f foo=bar https://posttestserver.com/post.php ) ;      done;      curl "${array[@]}";  } dumped 1 post variables. view @ http://www.posttestserver.com/data/2016/06/09/11.45.461371907842 (...) real    0m1.079s 

2. process @ n connections in parallel, avoid dos'ing host or machine

here sem gnu parallel limiting number of parallel connections 4. better version of backgrounding , waiting, since ensure full capacity.

for in {1..20}    sem -j 4 curl -f foo=bar https://posttestserver.com/post.php done sem --wait 

the number of parallel requests want depends on how beefy host is. realistic number 32+

combine 2 strategies, , should see hefty speedup without dos'ing yourself.