Multipart helper about httpx

[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.

[librehat]

I just found this issue closed with no further comments. I'm currently migrating from requests to httpx but I don't see what is the replacement of requests-toolbelt's MultipartEncoder? There is a convoluted request that I only managed to send with MultipartEncoder

[florimondmanca]

Agreed with Tom - right now our multipart support is provided by the files=... parameter, which made this issue irrelevant eventually, but happy to read about situations this doesn’t help you solve fully.

[librehat]

So this is what I'm currently sending using requests. In short, it is uploading a file to a GQL endpoint (ariadne)

    gql_query = {
    "query": """query (
    $input: Upload!
    ) {...}
    """, "variables": {"input": None} }
    encoder = MultipartEncoder(
        fields={
            "operations": json.dumps(gql_query),
            "map": """{
                "file": ["variables.input"]
            }""",
            "file": ("doc.pdf", open("doc.pdf", "rb"), "application/pdf"),
        }
    )
    requests.post("...", data=encoder, headers={"Content-Type": encoder.content_type})

I can make it work with httpx by

    httpx.post("...", data=encoder.to_string(), headers={"Content-Type": encoder.content_type})

I wasn't able to upload the file with plain requests so I used the toolbelt. Maybe I missed an obvious alley for me to do this?