Network protocol complements-get/post differences, common protocols, and ports

Source: Internet
Author: User
Tags ftp file ftp file transfer
The difference between get and post requests.
1, when the browser fallback and refresh, get harmless, but post will resubmit the data
2, get can be bookmarked, and post can not
3, get can be cached by the browser, and post can not
4. The encoding type of the GET request is application/x-www-form-urlencoded
The encoding type of the POST request can be application/x-www-form-urlencoded and multipart/form-data
5, get parameters for the existence of browsing history, and post does not
6, get the url+ parameter length limit 2048, and post No Limit
7, get only allow ASCI type data, and post does not now
8, get is not very safe, and post security


Network protocols and Ports
FTP File Transfer Port 21
telnet to telnet port 23
SMTP Simple Mail Transfer Protocol port 25
POP3 receiving mail Port 110
HTTP Hypertext Transfer Protocol Port 80
DNS Domain name resolution port 53

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