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How is http request via /dev/tcp different from that of curl?

From: Peng Yu
Subject: How is http request via /dev/tcp different from that of curl?
Date: Thu, 16 May 2024 18:24:44 -0500 
Hi,

$ curl 'http://httpbin.org/get' -H 'User-Agent: Mozilla/5.0
(Macintosh; Intel Mac OS X 10.15; rv:125.0) Gecko/20100101
Firefox/125.0' -H 'Accept: application/json' -H 'Accept-Language:
en-US,en;q=0.5' -H 'Accept-Encoding: gzip, deflate' -H 'Referer:
http://httpbin.org/' -H 'DNT: 1' -H 'Sec-GPC: 1' -H 'Connection:
keep-alive'
{
  "args": {},
  "headers": {
    "Accept": "application/json",
    "Accept-Encoding": "gzip, deflate",
    "Accept-Language": "en-US,en;q=0.5",
    "Dnt": "1",
    "Host": "httpbin.org",
    "Referer": "http://httpbin.org/";,
    "Sec-Gpc": "1",
    "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15;
rv:125.0) Gecko/20100101 Firefox/125.0",
    "X-Amzn-Trace-Id": "Root=1-66469337-0aab56e96f4fee271f6a09ce"
  },
  "origin": "xxx.xxx.xxx.xxx",
  "url": "http://httpbin.org/get";
}

I want to replicate the same thing in bash below. But the result is
not the same. How is the bash http request via /dev/tcp different from
that of curl?

exec {fd}<>/dev/tcp/httbin.org/80

echo -e "GET /get HTTP/1.1\r
Host: httpbin.org\r
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:125.0)
Gecko/20100101 Firefox/125.0\r
Accept: application/json\r
Accept-Language: en-US,en;q=0.5\r
Accept-Encoding: gzip, deflate\r
Referer: http://httpbin.org/\r
DNT: 1\r
Sec-GPC: 1\r
Connection: keep-alive\r
\r" >&"$fd"

function httpprotocol/recv {
  while IFS= read -u "$fd" -r; do
    if [[ $REPLY =~ ^([^:]+):\ *(.*)$'\r'$ ]]; then
      headers[${BASH_REMATCH[1],,}]=${BASH_REMATCH[2]}
    elif [[ $REPLY = $'\r' ]]; then
      LC_ALL=C read -u "$fd" -r -d '' -N "${headers[content-length]}" body
      break
    fi
 printf -v REPLY '%q' "$REPLY"
 echo "$REPLY"
  done
}

declare -A headers
$ httpprotocol/recv
$'HTTP/1.1 200 OK\r'
$'accept-ch: Sec-CH-UA, Sec-CH-UA-Platform,
Sec-CH-UA-Platform-Version, Sec-CH-UA-Mobile\r'
$'cache-control: max-age=0, private, must-revalidate\r'
$'connection: close\r'
$'content-length: 475\r'
$'content-type: text/html; charset=utf-8\r'
$'date: Thu, 16 May 2024 23:18:56 GMT\r'
$'server: nginx\r'
$'set-cookie: sid=ab0e69e8-13da-11ef-911e-ea384f7d4599; path=/;
domain=.httpbin.org; expires=Wed, 04 Jun 2092 02:33:03 GMT;
max-age=2147483647; HttpOnly\r'

$ declare -p headers
declare -A headers=([server]="nginx" [connection]="close"
[content-type]="text/html; charset=utf-8" [cache-control]="max-age=0,
private, must-revalidate"
[set-cookie]="sid=ab0e69e8-13da-11ef-911e-ea384f7d4599; path=/;
domain=.httpbin.org; expires=Wed, 04 Jun 2092 02:33:03 GMT;
max-age=2147483647; HttpOnly" [content-length]="475"
[accept-ch]="Sec-CH-UA, Sec-CH-UA-Platform,
Sec-CH-UA-Platform-Version, Sec-CH-UA-Mobile" [date]="Thu, 16 May 2024
23:18:56 GMT" )
$ echo "$body"
<html><head><title>Loading...</title></head><body><script
type='text/javascript'>window.location.replace('http://httpbin.org/get?ch=1&js=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJKb2tlbiIsImV4cCI6MTcxNTkwODczNiwiaWF0IjoxNzE1OTAxNTM2LCJpc3MiOiJKb2tlbiIsImpzIjoxLCJqdGkiOiIydjgxbW1wajdvc2w5b2M4M2swMHBwNmMiLCJuYmYiOjE3MTU5MDE1MzYsInRzIjoxNzE1OTAxNTM2NTQzNzg3fQ.Bc07CLhZ_HLw5QwfQoWotZPfoegQMRYc84bD-Wqg96k&sid=ab0e69e8-13da-11ef-911e-ea384f7d4599');</script></body></html>

-- 
Regards,
Peng
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