Hello everyone! With the help of Fiddler, I caught the following outgoing request (RAW):

POST https://account.rejoner.com/api/v1/user/signup HTTP/1.1
Host: account.rejoner.com
Connection: keep-alive
content length: 2663
sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="96", "Google Chrome";v="96"
sec-ch-ua-mobile: ?1
User-Agent: Mozilla/5.0 (Linux; Android 7.1.2; SM-N975F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.104 Mobile Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryKXAn4Aur4wlfjACa
Accept: application/json, text/plain, */*
X-Requested-With: XMLHttpRequest
X-Request-Id: 86c3d6b-d649-f6e2-a9f4-968c35b483d5
sec-ch-ua-platform: "Android"
Origin: https://account.rejoner.com
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://account.rejoner.com/signup?from=main_m_touch
Accept-Encoding: gzip, deflate, br
Accept-Language: ru-RU,ru;q=0.9
Cookies:
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="extended"
true
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="more_password_strength"
one
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="context"
sign up
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="browser"
{"screen":{"availWidth":"854","availHeight":"480","width":"854","height":"480","colorDepth":"24","pixelDepth": "24","availLeft":"0","availTop":"0"},
"navigator":{"vendorSub":"","productSub":"20030107","vendor":"Google Inc.","maxTouchPoints":"5","doNotTrack":"inaccessible","hardwareConcurrency": "4","cookieEnabled":"true","appCodeName":"Mozilla","appName":"Netscape","appVersion":"5.0 (Linux; Android 7.1.2; SM-N975F) AppleWebKit/537.36 ( KHTML, like Gecko) Chrome/96.0.4664.104 Mobile Safari/537.36","platform":"Linux i686","product":"Gecko","userAgent":"Mozilla/5.0 (Linux; Android 7.1.2; SM -N975F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.104 Mobile Safari/537.36","language":"en-US","onLine":"true","webdriver":"false"," pdfViewerEnabled":"false","deviceMemory":"4"},
"flash":{"version":"inaccessible"}}
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="from"
main_m_touch
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="sent_me_ads"
true
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="sent_me_ads_common"
true
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="name"
{"first":"Olya","last":"Monolya"}
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="birthday"
{"day":2,"month":4,"year":1986}
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="sex"
female
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="login"
monovaolya12
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="domain"
rejoner.com
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="password"
a=a=a=b=b=b=
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="restore"
{"secret":"-","secret_answer":"-","additional_email":"[email protected]"}
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="htmlencoded"
false
------WebKitFormBoundaryKXAn4Aur4wlfjACa
Content-Disposition: form-data; name="utm"
{"source":"","medium":"","campaign":"","term":"","content":""}
------WebKitFormBoundaryKXAn4Aur4wlfjACa--

The first part of the RAW is the headers, the second is the content of the form, well, that's pretty obvious.
If I repeat sending this request through Fiddler itself, then the server returns me a positive response. But if I try to send it throughrequests, it returns an error.
If I convert the first and second parts to their respective dictionaries and substitute in requests.post(url, data=data, headers=headers), then the server gives an error. If I substitute the second part in the form, but already in the formfiles=data(since the form is stillmultipart/form-data), then the interpreter itself swears thatfilesit should bebytes, but notdict.

In general, the question is simple. How to repeat the submitted query exactly usingrequests?