Multiple fields in one multipart/form-data request part

I am trying to use requestslibrary to upload some files, goal is to achieve this:

------WebKitFormBoundary61N9vqJ7380nh6iv
Content-Disposition: form-data; name="files"; filename="photo-2.jpeg"
Content-Type: image/jpeg


------WebKitFormBoundary61N9vqJ7380nh6iv
Content-Disposition: form-data; name="fileId"

b3duLWZpbGVzL2ZmZmZmZmZmYTQyNDVmODAvMjAxNTY*
------WebKitFormBoundary61N9vqJ7380nh6iv
Content-Disposition: form-data; name="extract"

false
------WebKitFormBoundary61N9vqJ7380nh6iv--

and now I have this:

${data}=    Evaluate    {'files': open("C:/testautomation/resources/Assets/photo-2.jpeg", 'r+b'), 'extract': (None, 'false'), 'fileId': (None, 'b3duLWZpbGVzL2ZmZmZmZmZmYTQyNDVmODAvMjAxNTY*')}
${result}=  Post Request  rest  ${url}  headers=${HEADERS}  files=${data}

I THINK that the only bit I am missing is the “Content-Type: image/jpeg” from the first part, but how on earth I can add that? Currently the file gets uploaded, but it is not considered to be a image file.

[emanlove]

@lucagiove what if the multiple parts are not all files?

*** Test Cases ***

Test Post On Session Multipart
    ${file}=  Get File For Streaming Upload  atests/randombytes.bin
    ${multipart_data}=   Create Dictionary  randombytes1  ${file}  author  EdManlove

    ${resp}=    POST On Session  ${GLOBAL_SESSION}   /anything  files=${multipart_data}

Here the requests library assumes both are files, I am assuming because I used the files argument. But if I try with data as in

    ${resp}=    POST On Session  ${GLOBAL_SESSION}   /anything  data=${multipart_data}

it does not seem to know the first is a file. Nor does it seem to build up the multipart data request.

[webloginwu]

I have the same requirement as @emanlove, robotframwork don’t support multiple parts that are not all files. I got the below error: The server cannot or will not process the request, only one file support