Propagate content length from filesystem through geny.Writable
and os.Source
#320
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This means downstream libraries like Requests-Scala or Cask can properly set the content length when handling
os.read.stream
s and similar values in their HTTP requests or responsesNoticed the lack of this when uploading to github failed in com-lihaoyi/mill#3686 due to the lack of content length header in the upload
Covered by unit tests