Re: Difference of packets sent via /dev/tcp to chromedriver and httpbin

[Leonid Isaev (ifax)]

On Thu, Apr 01, 2021 at 09:27:55PM -0500, Peng Yu wrote:
> main_chromedriver.sh below hangs there. Does anybody know why?

Hmm, chromedriver seems to ignore your "Connection: close"

> #!/usr/bin/env bash
> # vim: set noexpandtab tabstop=2:
> 
> {
>     req_header=(
>         "GET /sessions HTTP/1.1"
>         "Connection: close"
>     )
>     builtin printf '%s\r\n' "${req_header[@]}" '' >&"$fd"
>     while true; do
>         IFS= read -u "$fd" -r line || return
>         line=${line%$'\r'}
>         [[ $line ]] || break
>         builtin printf '%s\n' "$line"
>     done
>     sleep 1
>     cat <&"$fd"
> } {fd}<>/dev/tcp/127.0.0.1/9515
> 
> it prints something like this. And the script hangs.

Yes, because of

>     cat <&"$fd"

Try issuing another request to the server right after "sleep 1" -- cat(1)
should print the response. Also, what is the purpose of the while loop if you
are going to use cat(1) anyway?

HTH,

-- 
Leonid Isaev