What is the use of request getHeader?
getHeader. Returns the value of the specified request header as a String . If the request did not include a header of the specified name, this method returns null . If there are multiple headers with the same name, this method returns the first head in the request.
What is request getHeader?
From RFC 2616-sec14. The Host request-header field specifies the Internet host and port number of the resource being requested, as obtained from the original URI given by the user or referring resource. request. getHeader(“Host”); will return the value of the “Host” (in your case xxxxx.abcd.com) header in the request.
Which method of the HttpServletRequest object is used?
Object of the HttpServletRequest is created by the Servlet container and, then, it is passed to the service method (doGet(), doPost(), etc.) of the Servlet. Extends the ServletRequest interface to provide request information for HTTP servlets.
What is HttpServletRequest and HttpServletResponse?
The servlet container is connected to the web server that receives Http Requests from client on a certain port. When client sends a request to web server, the servlet container creates HttpServletRequest and HttpServletResponse objects and passes them as an argument to the servlet service() method.
What is HttpServletResponse in Java?
HttpServletResponse is a predefined interface present in javax.servlet.http package. It can be said that it is a mirror image of request object. The response object is where the servlet can write information about the data it will send back. Note that these interfaces adhere to the usual naming conventions for beans.
Which one is the correct order of phases in JSP life cycle?
Which one is the correct order of phases in JSP life cycle? Explanation: The correct order is Compilation, Initialization, Execution, Cleanup.
What is the use of HttpServletRequest?
HttpServletRequest. The javax. servlet. http package contains a number of classes and interfaces that describe and define the contracts between a servlet class running under the HTTP protocol and the runtime environment provided for an instance of such a class by a conforming servlet container.
What is a HttpServletResponse?
HttpServletResponse is a predefined interface present in javax. servlet. http package. It can be said that it is a mirror image of request object. The response object is where the servlet can write information about the data it will send back.
What is servlet life cycle?
A servlet life cycle can be defined as the entire process from its creation till the destruction. The servlet is initialized by calling the init() method. The servlet calls service() method to process a client’s request. The servlet is terminated by calling the destroy() method.
Why servlet filter is used?
A filter is an object that is invoked at the preprocessing and postprocessing of a request. It is mainly used to perform filtering tasks such as conversion, logging, compression, encryption and decryption, input validation etc.
What is servlet response?
Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponse object and passes it as an argument to the servlet’s service method. To send binary data in a MIME body response, use the ServletOutputStream returned by getOutputStream() .
What is HttpServletResponse used for?
Interface HttpServletResponse. Extends the ServletResponse interface to provide HTTP-specific functionality in sending a response. For example, it has methods to access HTTP headers and cookies.
How to get the header of a servlet?
The getHeaderNames () of ServletRequest interface returns an Enumeration object, containing all the header names. The getHeader () method of ServletRequest interface returns the header value for the given header name.
How to get the HTTP request header in Java?
This example shows you how to get the HTTP request headers in Java. To get the HTTP request headers, you need this class HttpServletRequest : 1. HttpServletRequest Examples 1.1 Loop over the request header’s name and print out its value. Request Headers example : 1.2 Get the “user-agent” header only.
How to create a Servlet Filter in Java?
Typecast ServletRequest into HttpServletRequest (only if ServletRequest request is an instanceof HttpServletRequest ). Then you can use HttpServletRequest.getHeader () and HttpServletRequest.getHeaderNames () method. ‘HttpServletReqiest’ IS A ‘ServletRequest’. It is a sub-interface of. ServletRequest.
How does HttpServletResponse extend the Servlet API?
public interface HttpServletResponse extends ServletResponse Extends the ServletResponseinterface to provide HTTP-specific functionality in sending a response. For example, it has methods to access HTTP headers and cookies.
