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eTags – Social Tags Community
This works fine on most browsers, and unfortunately it doesn’t work quite as you would expect in IE. Etag calculation was separated from upload response as a performance optimization. Something called a Weak ETag. The difference in this case is that IE handles the as expected, replacing the cached version with the new content and updating the ETag metadata in etas cache for this resource.
Till Death Do Us Part
I’m seeing what appear to be valid eTags returned following the POST and I want to verify that that they’re etgas. Sign up or log in Sign up using Google. I will find a workaround. April and salary with experience.
Fortunately, there is a lesser known cousin to Last-Modified that IE supports pretty well. The notion of etag is not familiar for me. Yes, we moved the ETag calculation into a separate thread and got it processed in parallel with the rest of the upload.
I was hoping to find a configuration setting to prevent the Weak ETag behavior I was seeing for static content but turned up nothing.
curl – Why is etag “null” from the returned File object when uploading a file? – Stack Overflow
Instead I found a little gem hiding in the context. This is as simple as returning the content with an updated Last-Modified date as seen below: I’m not sure Tomcat is doing the right thing with using Weak ETags by default, and I’ll probably post some of these comments to the Tomcat mailing list for consideration, but for now I’ve got caching behaving as I would expect.
Since you are uploading, the data obviously just changed. Etag is a mechanism used for ccouple cache validation, it prevents a proxy or client from downloading redundant data that hasn’t changed. The obvious inof is to use the Last-Modified header with the timestamp of the file.
The same workflow is used for ETag processing, but with a couple of different headers: What use would it be when uploading? Subsequent updates to the comments or formatting of the document would not change the actual “meaning” of the returned result. Planned maintenance scheduled April 23, at By the time the upload is done, we now give you back the ETag in the upload response.
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DefaultServlet simply generates a Weak ETag by concatenating the content length and the last modified time in millisecondssending it back to the browser to basically be ignored.
Thu, 27 Sep Jan Have you been able to start calculating the eTag in parallel with the upload? With the current API, the etag always returns null when uploading the file. The problem is that Tomcat shows loyalties to the dark side when it comes to static content.
If the code itsself changed, however a new Weak ETag would be generated and returned.