Writing data to the server
Sometimes you need to write data to the URLConnection
the getOutputStream () method returns an OutputStream
It can be used to write data to the server
Since then URLConnection output is not allowed by default
It must be called setDoOutput (true) method prior to re-request output stream
GET request method will become POST
Step submit form data:
URLConnection security concerns
There are some common security restrictions establish a network connection, read and write files, etc.
URLConnection objects to be bound by these security limitations
The URL of the connection permissions needed
No permissions will return null
URLConnection subclasses will but hava.security.Permission different subclasses
Guess MIME media type
Content guess the name of the object file attempts to expand according to UR
As a result of the speculation String Returns
Try to see the first few bytes to guess the content stream type
HTTPURLConnection
Request method
Disconnect from server
Response processing server
Redirect
proxy
