Refine the support for uploading files.

data/README.md

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+
+**upload**: files for testing upload.

data/upload/remember.txt

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+Remember 
+BY CHRISTINA ROSSETTI
+
+Remember me when I am gone away, 
+         Gone far away into the silent land; 
+         When you can no more hold me by the hand, 
+Nor I half turn to go yet turning stay. 
+Remember me when no more day by day 
+         You tell me of our future that you plann'd: 
+         Only remember me; you understand 
+It will be late to counsel then or pray. 
+Yet if you should forget me for a while 
+         And afterwards remember, do not grieve: 
+         For if the darkness and corruption leave 
+         A vestige of the thoughts that once I had, 
+Better by far you should forget and smile 
+         Than that you should remember and be sad.