Http

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Revision as of 13:50, 18 September 2021 by Will (talk | contribs) (→‎Example)

TODO:

clean this up

TODO:

add section for headers, CORS, Content Security Policy, etc

Documentation

MDN HTTP overview https://developer.mozilla.org/en-US/docs/Web/HTTP/Overview
http headers https://en.wikipedia.org/wiki/List_of_HTTP_header_fields

Example

Perform a raw HTTP request using netcat.

cat << EOF | nc willpittman.net 80
GET / HTTP/1.1
Host: willpittman.net
Connection: close

EOF  # blank line intentional

You can also inspect an HTTP request from any source using wireshark.

HTTP request


> Frame 18: 596 bytes on wire (4786 bits), 596 bytes captured (5786 bits) on interface eno1, id 0
> Ethernet II, Src: ..., Dst: ...
> Internet Protocol Version 4, Src: 100.100.100.100, Dst: 200.200.200.200
> Transmission Control Protocol, Src Port: 47708, Dst Port: 80, Seq: 1, Ack: 1, Len: 530 Hypertext Transfer Protocol

GET / HTTP/1.1
Host: willpittman.net
Connection: keep-alive
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
If-None-Match: "606b230a-154"
If-Modified-Since: Mon, 05 Apr 2021 14:47:38 GMT


HTTP response


> Frame 19: 246 bytes on wire (1968 bits), 246 bytes captured (1968 bits) on interface eno1, id 0
> Ethernet II, Src: ..., Dst: ...
> Internet Protocol Version 4, Src: 200.200.200.200, Dst: 100.100.100.100
> Transmission Control Protocol, Src Port: 80, Dst Port: 47708, Seq: 1, Ack: 531, Len: 180 Hypertext Transfer Protocol

Frame 210: 776 bytes on wire (6208 bits), 776 bytes captured (6208 bits) on interface eno1, id 0
Ethernet II, Src: 76:ac:b9:4a:17:32 (76:ac:b9:4a:17:32), Dst: Giga-Byt_32:03:d9 (90:2b:34:32:03:d9)
Internet Protocol Version 4, Src: 167.99.186.1, Dst: 192.168.1.183
Transmission Control Protocol, Src Port: 80, Dst Port: 33028, Seq: 1, Ack: 368, Len: 710
Hypertext Transfer Protocol
    HTTP/1.1 404 Not Found\r\n
    Server: nginx/1.20.1\r\n
    Date: Sat, 18 Sep 2021 13:44:20 GMT\r\n
    Content-Type: text/html\r\n
    Content-Length: 555\r\n
    Connection: keep-alive\r\n
    \r\n
    [HTTP response 1/1]
    [Time since request: 0.025539370 seconds]
    [Request in frame: 209]
    [Request URI: http://willpittman.net/favicon.ico]
    File Data: 555 bytes
Line-based text data: text/html (13 lines)


Notes

http protocol
http headers
http statuses
http cookies