By the help of HttpURLConnection class, you can retrieve information of any HTTP URL such as header information, status code, response code etc.
The java.net.HttpURLConnection is subclass of URLConnection class.
Method |
Description |
void disconnect() |
It shows that other requests from the server are unlikely in the near future. |
InputStream getErrorStream() |
It returns the error stream if the connection failed but the server sent useful data. |
Static boolean getFollowRedirects() |
It returns a boolean value to check whether or not HTTP redirects should be automatically followed. |
String getHeaderField(int n) |
It returns the value of nth header file. |
long getHeaderFieldDate(String name, long Default) |
It returns the value of the named field parsed as a date. |
String getHeaderFieldKey(int n) |
It returns the key for the nth header file. |
boolean getInstanceFollowRedirects() |
It returns the value of HttpURLConnection's instance FollowRedirects field. |
Permission getPermission() |
It returns the SocketPermission object representing the permission to connect to the destination host and port. |
String getRequestMethod() |
It gets the request method. |
int getResponseCode() |
It gets the response code from an HTTP response message. |
String getResponseMessage() |
It gets the response message sent along with the response code from a server. |
void setChunkedStreamingMode(int chunklen) |
The method is used to enable streaming of a HTTP request body without internal buffering, when the content length is not known in advance. |
void setFixedLengthStreamingMode(int contentlength) |
The method is used to enable streaming of a HTTP request body without internal buffering, when the content length is known in advance. |
void setFixedLengthStreamingMode(long contentlength) |
The method is used to enable streaming of a HTTP request body without internal buffering, when the content length is not known in advance. |
static void setFollowRedirects(boolean set) |
It sets whether HTTP redirects (requests with response code) should be automatically followed by HttpURLConnection class. |
void setInstanceFollowRedirects(boolean followRedirects) |
It sets whether HTTP redirects (requests with response code) should be automatically followed by instance of HttpURLConnection class. |
void setRequestMethod(String method) |
Sets the method for the URL request, one of: GET POST HEAD OPTIONS PUT DELETE TRACE are legal, subject to protocol restrictions. |
abstract boolean usingProxy() |
It shows if the connection is going through a proxy. |
The openConnection() method of URL class returns the object of URLConnection class.
You can typecast it to HttpURLConnection type as given below.
Date = Thu, 22 Jul 2021 18:08:17 GMT
Server = Apache
Location = https://www.javatpoint.com/java-tutorial
Cache-Control = max-age=2592000
Expires = Sat, 21 Aug 2021 18:08:17 GMT
Content-Length = 248
Keep-Alive =timeout=5, max=1500
Connection = Keep-Alive