fix: Form::text on wasm setting octet-stream mime type and file name. #2174
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Closes #1740, Closes #2002
Unfortunately JS's fetch API is somewhat limited and only supports two
options for multipart form data parts:
interpreted as text/plain).
mime type if provided by the user.
Until this commit, reqwest always used the latter option, so when a user
tried to add a text part with no file name, it would be sent with a mime
type of
application/octet-stream
and the filename "blob".While we can't make the behaviour identical to the native
implementation, we can do a best-effort approach, using option (1) as
long as the user hasn't set a file name or a non plain text mime type.