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Fix send_file to work with non-ascii filenames
This commit implements https://tools.ietf.org/html/rfc2231#section-4 in order to support sending unicode characters. Tested on both Firefox and Chromium under Linux. This adds unidecode as a dependency, which might be relaxed by using .encode('latin-1', 'ignore') but wouldn't be as useful. Also, added a test for the correct headers to be added. Previously, using a filename parameter to send_file with unicode characters, it failed with the next error since HTTP headers don't allow non latin-1 characters. Error on request: Traceback (most recent call last): File "/usr/lib/python3.6/site-packages/werkzeug/serving.py", line 193, in run_wsgi execute(self.server.app) File "/usr/lib/python3.6/site-packages/werkzeug/serving.py", line 186, in execute write(b'') File "/usr/lib/python3.6/site-packages/werkzeug/serving.py", line 152, in write self.send_header(key, value) File "/usr/lib64/python3.6/http/server.py", line 509, in send_header ("%s: %s\r\n" % (keyword, value)).encode('latin-1', 'strict')) UnicodeEncodeError: 'latin-1' codec can't encode character '\uff0f' in position 58: ordinal not in range(256) Fixes pallets#1286
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