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how to use getLastModified() ?

hasan khan
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Eclipse IDE Firefox Browser Java
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i have a servlet reading an image from different web site and writing back to ServletOutputStream

in this case how do i use getLastModified()

i know i have to call URLConnection.getLastModified(), but how and where to call this method ?
the simpler solution looks to me is to write getLastModified(HttpServletRequest) as follow

but i dont want to open connection twice
as there any other way without comprimising performance?
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