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Can I use setHeader to set an new header?
Or Do I need to addHeader first, then use setHeader method?
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The AddHeader method adds a new HTML header and value to the response sent to the client. It does not replace an existing header of the same name. After a header has been added, it cannot be removed.
addHeader(String name, String value) method adds a MimeHeader object with the specified name and value to this MimeHeaders object's list of headers.
public abstract interface HttpServletResponse extends ServletResponse. Defines an HTTP servlet response that a servlet running on a Web server sends to a client using HTTP. This interface allows the servlet's service method to access HTTP headers and return data to its client.
The documentation says that you can add multiple values to a particular header using the addHeader method, whereas an initial value would be overwritten if you use the setHeader method.
In both cases a non-existent header would be created.
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Javadocs are your friend:
void addHeader(String name, String value) Adds a response header with the given name and value. This method allows response headers to have multiple values.
void setHeader(String name, String value) Sets a response header with the given name and value. If the header had already been set, the new value overwrites the previous one. The containsHeader method can be used to test for the presence of a header before setting its value.
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