SimpleHTTPUploadServer (from https://stackoverflow.com/a/58255859/446106 by smidgey)

example.sh

# https://stackoverflow.com/a/58255859/446106

HOST=1.2.3.4
FILE1=foo.txt
FILE2=bar.txt

# Running the server on your host:
python3 ./httpupload.py

#  Download a file from your host: 
curl -O http://$HOST:44444/$FILENAME

#  Upload a file back to your host: 
curl -F "file=@$FILE1" http://$HOST:44444/


#  Multiple file upload supported, just add more -F 'file=@<FILENAME>'
#  parameters to the command line.
curl -F "file=@$FILE1" -F "file=@$FILE2" http://$HOST:44444/

httpupload.py

#!/usr/env python3
import http.server
import socketserver
import io
import cgi

# Change this to serve on a different port
PORT = 44444

class CustomHTTPRequestHandler(http.server.SimpleHTTPRequestHandler):

    def do_POST(self):        
        r, info = self.deal_post_data()
        print(r, info, "by: ", self.client_address)
        f = io.BytesIO()
        if r:
            f.write(b"Success\n")
        else:
            f.write(b"Failed\n")
        length = f.tell()
        f.seek(0)
        self.send_response(200)
        self.send_header("Content-type", "text/plain")
        self.send_header("Content-Length", str(length))
        self.end_headers()
        if f:
            self.copyfile(f, self.wfile)
            f.close()      

    def deal_post_data(self):
        ctype, pdict = cgi.parse_header(self.headers['Content-Type'])
        pdict['boundary'] = bytes(pdict['boundary'], "utf-8")
        pdict['CONTENT-LENGTH'] = int(self.headers['Content-Length'])
        if ctype == 'multipart/form-data':
            form = cgi.FieldStorage( fp=self.rfile, headers=self.headers, environ={'REQUEST_METHOD':'POST', 'CONTENT_TYPE':self.headers['Content-Type'], })
            print (type(form))
            try:
                if isinstance(form["file"], list):
                    for record in form["file"]:
                        open("./%s"%record.filename, "wb").write(record.file.read())
                else:
                    open("./%s"%form["file"].filename, "wb").write(form["file"].file.read())
            except IOError:
                    return (False, "Can't create file to write, do you have permission to write?")
        return (True, "Files uploaded")

Handler = CustomHTTPRequestHandler
with socketserver.TCPServer(("", PORT), Handler) as httpd:
    print("serving at port", PORT)
    httpd.serve_forever()

uploadform.html

<!-- https://gist.github.com/yczheng0/e1bf7b0986dcc871a1f919e2138fb737/059aca1d510c615df3d9fedafabac4d538ebe352#file-simplehttpserverwithupload-py-L191 -->
<form ENCTYPE="multipart/form-data" action="/" method=post>
 <input type=file name=file>
 <input type=submit>
</form>