Re: 有没有办法在browser第一次访问的时候知道是不是支持cookie? - 未名空间MITBBS历史存档

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Re: 有没有办法在browser第一次访问的时候知道是不是支持cookie?

Re: 有没有办法在browser第一次访问的时候知道是不是支持cookie?# Java - 爪哇娇娃

o*e2005-04-04 07:04

1 楼

nope.
but you can do a redirect for a new session,
see if the 2nd request carries the cookie,
then do another redirect to the original request.

d*r2005-04-04 07:04

2 楼

多谢指教。
我也想到过这样做，不过觉得挺笨的。
有没有更好的解决方法呢？

有没有办法在browser第一次访问我的servlet的时候就知道该Browser是不是支持cookie?
而如果Browser支持cookie的话，上述";jsessionid=956BDE2350B3D6804965F328A3FBB63E
就会在第一次的页面输出中把所有的LINK都encode()上，就是带有：";jsessionid=956BD

【在 o***e 的大作中提到】

: nope.
: but you can do a redirect for a new session,
: see if the 2nd request carries the cookie,
: then do another redirect to the original request.

o*e2005-04-04 07:04

3 楼

no, that's the way it is.

【在 d********r 的大作中提到】

: 多谢指教。
: 我也想到过这样做，不过觉得挺笨的。
: 有没有更好的解决方法呢？
:
: 有没有办法在browser第一次访问我的servlet的时候就知道该Browser是不是支持cookie?
: 而如果Browser支持cookie的话，上述";jsessionid=956BDE2350B3D6804965F328A3FBB63E
: 就会在第一次的页面输出中把所有的LINK都encode()上，就是带有：";jsessionid=956BD

m*t2005-04-04 07:04

4 楼

But what's the point to start a new session on the *very first*
request? At this point the user has not done anything that needs
to be treated individually.
If you need to deal with a returning user from previous sessions,
then his browser must have cookie support, otherwise there is
no way for you to identify him as a returning user to begin with.

【在 d********r 的大作中提到】

c*g2005-04-04 07:04

5 楼

if user bookmarked the url with sessionid, then he can identify him
as a returning user before the session expired.

【在 m******t 的大作中提到】

:
: But what's the point to start a new session on the *very first*
: request? At this point the user has not done anything that needs
: to be treated individually.
: If you need to deal with a returning user from previous sessions,
: then his browser must have cookie support, otherwise there is
: no way for you to identify him as a returning user to begin with.

o*e2005-04-04 07:04

6 楼

some companies are obsessed with tracking usage pattern.

【在 m******t 的大作中提到】

m*t2005-04-04 07:04

7 楼

That's different. Before your session expires, your request is a
*returning* request, not the first one, regardless you came back with
a bookmark or not.
If an app wishes to recognize a returning user with a session id
that has already expired, then it would have to at least persist
this session id somewhere and *keep it forever* because it never
knows when the user is going to come back with that id.

【在 c**g 的大作中提到】

:
: if user bookmarked the url with sessionid, then he can identify him
: as a returning user before the session expired.