HTTP PUT Multi-part request headers issue

[camilovelezr]

Julia 1.6.1
HTTP.jl 0.9.13
MbedTLS.jl 1.0.3

---

Hello, I have found what I think is a bug in HTTP.put() when making a multi-part request.
POST multi-part requests work fine, I will provide an example to illustrate my point.

I am using HTTP.jl to interact with the REST API of Cordra. REST API Documentation. But I think this is a general issue.

POST Request

My code

port = "http://localhost:8000"
open("hw.txt") do io
    headers = []
    data = [
        "content" => JSON.json(Dict("This is a" => "test")),
        "File1" =>  HTTP.Multipart("MyFile", io)
    ]
    body = HTTP.Form(data)
    HTTP.post(port, headers, body; require_ssl_verification = false, status_exception = false)
end

Request

Notice how the content-type is automatically defined.

PUT Request

My code

port = "http://localhost:8000"
open("hw.txt") do io
    headers = []
    data = [
        "content" => JSON.json(Dict("This is a" => "test")),
        "File1" =>  HTTP.Multipart("MyFile", io)
    ]
    body = HTTP.Form(data)
    HTTP.put(port, headers, body; require_ssl_verification = false, status_exception = false)
end

Request

Notice how content-type is missing.
In this specific case, if I try to pass this request to Cordra, Cordra will be unable to parse the content of the request. My guess is that the issue is the missing content-type (and therefore, the missing "boundary" argument) in the headers.

Manual Fix

This problem can be fixed by manually specifying the content-type header (including manually choosing a boundary):

port = "http://localhost:8000"
open("hw.txt") do io
    headers = ["Content-type" => "multipart/form-data; boundary=myboundary"]
    data = [
        "content" => JSON.json(Dict("This is a" => "test")),
        "File1" =>  HTTP.Multipart("MyFile", io)
    ]
    body = HTTP.Form(data; boundary = "myboundary")
    HTTP.put(port, headers, body; require_ssl_verification = false, status_exception = false)
end

Request

This request looks similar to the POST request. Cordra will accept it.

---

I think HTTP.put() needs some tuning to be able to generate the content-type headers when working with HTTP.Form multi-part requests.

Please let me know if any additional information is needed.
Thank you!

[fredrikekre]

See https://discourse.julialang.org/t/send-multipart-request-from-julia-using-http-jl/60148/9. Wan't to make a PR to enable this for PUT too?