Multipart helper

The first part of this would be a class that just implements taking a files/data dict, and returning the byte-wise multipart content, plus the Content-Type header.

Places to start with this include urllib3, and the requests-toolbelt streaming multipart encoder.

[florimondmanca]

Sure, so I think you need to split up between data=... (for operations and map) and files=... (for doc.pdf), something like this…

data = {
    "operations": json.dumps(gql_query),
    "map": """{
        "file": ["variables.input"]
    }""",
}

files = {
    "file": ("doc.pdf", open("doc.pdf", "rb"), "application/pdf"),
}

response = httpx.post(..., data=data, files=files)

The multipart encoding occurs whenever files=... is passed and non-empty, so in this case it will use whatever is in data as additional fields in the multipart form data.

This behavior is actually not crystal clear in the docs I believe, could probably use a “You can also add additional fields by passing data=...” in Sending Multipart Form Uploads.

[tomchristie]

There is a convoluted request that I only managed to send with MultipartEncoder

You’d need to be providing more details about exactly what you’re not able to do with httpx’s multiparty support in order for us to be able to help at all.