exercise 2.5

exercise 2.5

Программа для отправки:
import requests

payload = {
    "github": "MyNickName",
    "Name": "MyName",
    "Surname": "MySurname"
    }
resp = requests.post('http://httpbin.org/post',
                     headers={
                         'Host': 'httpbin.org',
                         'Accept': '*/*',
                         'Content-Type': 'application/x-www-form-urlencoded'
                     },
                     data = payload
                     )
# also output headers in response
answer_string = str(resp.headers).replace(', ', '\n')[1:-1] + "\n"
answer_string += resp.content.decode(resp.apparent_encoding)

print(answer_string)

Трафик, перехваченный программой tcpdump
tcpdump: listening on enp0s3, link-type EN10MB (Ethernet), capture size 262144 bytes
15:59:55.286314 IP (tos 0x0, ttl 64, id 31424, offset 0, flags [DF], proto TCP (6), length 60)
    10.0.2.15.47176 > 54.175.219.8.80: Flags [S], cksum 0x1df5 (incorrect -> 0xcec8), seq 3046766837, win 29200, options [mss 1460,sackOK,TS val 229941 ecr 0,nop,wscale 7], length 0
15:59:55.451251 IP (tos 0x0, ttl 64, id 1007, offset 0, flags [none], proto TCP (6), length 44)
    54.175.219.8.80 > 10.0.2.15.47176: Flags [S.], cksum 0xb6e1 (correct), seq 4480001, ack 3046766838, win 65535, options [mss 1460], length 0
15:59:55.451293 IP (tos 0x0, ttl 64, id 31425, offset 0, flags [DF], proto TCP (6), length 40)
    10.0.2.15.47176 > 54.175.219.8.80: Flags [.], cksum 0x1de1 (incorrect -> 0x5c8e), ack 1, win 29200, length 0
15:59:55.451634 IP (tos 0x0, ttl 64, id 31426, offset 0, flags [DF], proto TCP (6), length 302)
    10.0.2.15.47176 > 54.175.219.8.80: Flags [P.], cksum 0x1ee7 (incorrect -> 0x32fd), seq 1:263, ack 1, win 29200, length 262: HTTP, length: 262
	POST /post HTTP/1.1
	Content-Length: 47
	Accept-Encoding: gzip, deflate
	Connection: keep-alive
	Accept: */*
	User-Agent: python-requests/2.9.1
	Host: httpbin.org
	Content-Type: application/x-www-form-urlencoded
	
	github=MyNickName&Surname=MySurname&Name=MyName[!http]
15:59:55.451950 IP (tos 0x0, ttl 64, id 1008, offset 0, flags [none], proto TCP (6), length 40)
    54.175.219.8.80 > 10.0.2.15.47176: Flags [.], cksum 0xcd98 (correct), ack 263, win 65535, length 0
15:59:55.622143 IP (tos 0x0, ttl 64, id 1009, offset 0, flags [none], proto TCP (6), length 730)
    54.175.219.8.80 > 10.0.2.15.47176: Flags [P.], cksum 0xa4aa (correct), seq 1:691, ack 263, win 65535, length 690: HTTP, length: 690
	HTTP/1.1 200 OK
	Server: nginx
	Date: Sat, 26 Mar 2016 10:59:55 GMT
	Content-Type: application/json
	Content-Length: 470
	Connection: keep-alive
	Access-Control-Allow-Origin: *
	Access-Control-Allow-Credentials: true
	
	{
	  "args": {}, 
	  "data": "", 
	  "files": {}, 
	  "form": {
	    "Name": "MyName", 
	    "Surname": "MySurname", 
	    "github": "MyNickName"
	  }, 
	  "headers": {
	    "Accept": "*/*", 
	    "Accept-Encoding": "gzip, deflate", 
	    "Content-Length": "47", 
	    "Content-Type": "application/x-www-form-urlencoded", 
	    "Host": "httpbin.org", 
	    "User-Agent": "python-requests/2.9.1"
	  }, 
	  "json": null, 
	  "origin": "212.193.94.11", 
	  "url": "http://httpbin.org/post"
	}
15:59:55.622252 IP (tos 0x0, ttl 64, id 31427, offset 0, flags [DF], proto TCP (6), length 40)
    10.0.2.15.47176 > 54.175.219.8.80: Flags [.], cksum 0x1de1 (incorrect -> 0x544e), ack 691, win 30360, length 0
15:59:55.623138 IP (tos 0x0, ttl 64, id 31428, offset 0, flags [DF], proto TCP (6), length 40)
    10.0.2.15.47176 > 54.175.219.8.80: Flags [F.], cksum 0x1de1 (incorrect -> 0x544d), seq 263, ack 691, win 30360, length 0
15:59:55.623512 IP (tos 0x0, ttl 64, id 1010, offset 0, flags [none], proto TCP (6), length 40)
    54.175.219.8.80 > 10.0.2.15.47176: Flags [.], cksum 0xcae5 (correct), ack 264, win 65535, length 0
15:59:55.783607 IP (tos 0x0, ttl 64, id 1011, offset 0, flags [none], proto TCP (6), length 40)
    54.175.219.8.80 > 10.0.2.15.47176: Flags [F.], cksum 0xcae4 (correct), seq 691, ack 264, win 65535, length 0
15:59:55.783638 IP (tos 0x0, ttl 64, id 3730, offset 0, flags [DF], proto TCP (6), length 40)
    10.0.2.15.47176 > 54.175.219.8.80: Flags [.], cksum 0x544c (correct), ack 692, win 30360, length 0

Описание

В трафике видим множественные обмены пакетами, так как передача происходит по протоколу tcp. Можем также видеть полученный от httpbin ответ
в удобочитаемом виде.