How can I make a bash script that reads a line after every http request

I have 700 lines (string) and I was wondering how I can make a bash script that sends an HTTP request using curl when it runs the first time such that it will send the first request with the first line, then when it sends the second request it will use the second line, 3rd request, it will use the 3rd line, ..., 700th request will use the 700th line then repeat.

Also what do you think is better? Using a .csv file to read the strings from, for example:

while IFS=, read -r example
do
   ...
done < filename.csv

Or using a for-loop inside the script, for example:

arr=( "string1" "string2" "string3" .."string700" )
for i in "${arr[@]}"
do
  echo $i
done

If you want to loop the list supplied in the comment, a newline-separated file will work fine as user-agents will not contain any newlines.

#!/bin/bash

mapfile -t < user-agents.txt
while :; do
    for agent in "${MAPFILE[@]}"; do
        curl -A "$agent" http://localhost/
        sleep 0.2
    done
done