Add multipart content types full support

[kotokur]

Add special tree editor to give the ability to implement complex cases of multipart/form-data, multipart/related and multipart/mixed content types. In this editor we can create parts with it's own content types included multipart types itself. Type of the each value editor will changes depends on selected content type. In this way we get the ability to implement recursive structures as well.

[kotokur]

Also I suggest to give an option to copy the raw body text that was designed with the tree editor to the clipboard

[kotokur]

Also you can read related discussions in Postman and Insomnia clients here:
postmanlabs/postman-app-support#1104
Kong/insomnia#623

[ranjan-purbey]

Is this being worked upon?

[richmar10]

Workaround: I struggled with this as well however I found a short term solution that might work for someone else.

Step 1) Set the Content-Type = multipart/mixed;boundary=xxBOUNDARYxx
Step 2) Set the Body = Raw
Step 3) Body content:

--xxBOUNDARYxx
Content-Type: application/json

{
    "Text": "myfile",
    "Html": "<p>myfile</p>"
}

--xxBOUNDARYxx
Content-Disposition: form-data; name=""; filename="text.txt"
Content-Type: text/plain

Text goes here.
--xxBOUNDARYxx--

The current version of postman seems to be really close to a full multipart implementation (for our use case),

This has been an amazing tool for testing, and I wanted to say thanks for all the improvements you have made over the years!

[dima11221122]

Thank you, @richmar10 for the workaround. We would like to add a convenient editor to manage multipart/mixed body. But safer to assume multipart/mixed is a recursive content-type: multipart/mixed can be as a part of multipart/mixed=) This complicates the issue.

[ash-eng-spin]

Has this ever been updated? I'm on Insomnia 8.6.0 and do not see the ability for the user to edit content-types for the parts in a multi-part request. This is a show stopper for us.