FYI:
In several places in my apps, I allow people to download CSV file, and I
generate the name of those files dynamically:
self.response.headers["Content-Type"] = "application/x-download"
self.response.headers["Content-Disposition"] = "attachment;filename=%s
CDN.csv" % client.name
This used to work just fine, but with the 1.4.0 release, that generates this
error:
AssertionError: Header values must be strings
This was easily fixed by forcing the header value to NOT be unicode:
self.response.headers["Content-Type"] = "application/x-download"
self.response.headers["Content-Disposition"] = str("attachment;filename=%s
CDN.csv" % client.name)
Clearly, the old code was technically wrong, although in my case, it wouldn't
have ever been an issue.
I recommend that you search for the pattern: headers.*%s in your source code,
so you don't get bit by this new assertion!
-Joshua
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