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

From: Peng Yu
Subject: Re: How is http request via /dev/tcp different from that of curl?
Date: Fri, 17 May 2024 06:43:58 -0500 
I know. But I need to establish one tcp connection and submit multiple
requests using the same connection. I don’t want the connection be closed
while I process the response. None external tools can achieve this.

On Fri, May 17, 2024 at 5:40 AM alex xmb sw ratchev <fxmbsw7@gmail.com>
wrote:

> other tools to make tcp scripts are socat
> http://www.dest-unreach.org/socat/ and tcpclient and tcpserver from
> ucspi-tcp https://cr.yp.to/ucspi-tcp.html
>
> On Fri, May 17, 2024, 01:25 Peng Yu <pengyu.ut@gmail.com> wrote:
>
>> 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
>>
>> --
Regards,
Peng
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