Multithreading curl commands in bash

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Bash

cURL

here is a shell script which takes domain and its parameters to find status code . this runs way faster due to threading but misses lot of requests.



if i ran normally it process all requests but the speed is very low. is there a way through which speed is maintained and it also not misses all requests .

What I have tried:

while IFS= read -r url <&3; 
do while IFS= read -r uri <&4;
 do urlstatus=$(curl -o /dev/null --insecure --silent --head --write-out '%{http_code}' "${url}""${uri}" --max-time 5 ) && 
echo "$url $urlstatus $uri" >> urlstatus.txt & 
done 4<uri.txt
 done 3<url.txt