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Add notes on "filename" form-data field #1704

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7 changes: 7 additions & 0 deletions docs/requests.md
Expand Up @@ -142,6 +142,13 @@ filename = form["upload_file"].filename
contents = await form["upload_file"].read()
```

!!! info
As settled in [RFC-7578: 4.2](https://www.ietf.org/rfc/rfc7578.txt), form-data content part that contains file
assumed to have `name` and `filename` fields in `Content-Disposition` header: `Content-Disposition: form-
data; name="user"; filename="somefile"`. Though `filename` field is optional according to RFC-7578, it helps
Starlette to differentiate which data should be treated as file. If `filename` field was supplied, `UploadFile`
object will be created to access underlying file, otherwise form-data part will be parsed and available as a raw
string.

#### Application

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