So Ive just coded my page like to only show a back link when actually come from another page.
<% if (request.getHeader("REFERER")!=null) { %>
<p><a href="<%=request.getHeader("REFERER")%>">back</a></p>
<% } %>
<p></p>Jon Wingfield wrote:
Also from Section 14.36 of rfc2616:
<extract>
The Referer field MUST NOT be sent if the Request-URI was obtained from source that does not have its own URI, such as input from the user keyboard.
</extract>
So you can't rely on it being present.
Shapira, Yoav wrote:
Hi,
But I have 2 questions: 1. Where are these header values defined I've not beeen able to find a good source.
See the HTTP protocol RFC itself for common headers like referrer. Other servers and routers may add custom headers along the way. Your app and other apps can also use custom headers if they wish.
2. It worked when coming from my pages but I then tried going to another page (e.g www.sun.com) and then pasting in the url and it just returned null. Does referer only apply when hyperlink from another
page ?
Some browsers, including IE, are known to have bugs regarding the referrer header. Sometimes it's null or not included in the request at all. So your app, if it uses the referrer header, must be tolerant of these bugs.
What about a history.go(-1) alternative to the referrer header?
Yoav
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