multipart/form-data implementation

[mission-liao]

Tend to provide an implementation. However, the encoding spec of filename, field name with non-ASCII chars is really a mess.

At first, I think the right way is to apply RFC2047, but it states this algorithm can't apply on a "a MIME Content-Type or Content-Disposition field". Then the second spec I found is RFC2231. And I plan to do it until I finally found another SO question.

In short, they suggested to send those names, attributes in utf-8, which is not official but supported by most major web servers, because almost all browsers did this part in this way...

After all this survey, now I feel ready for multipart/form-data.
https://github.com/AntXlab/pyswagger/labels

[mission-liao]

resolved in mission-liao/pyswagger@ 2c9e4ea