$ pip install parserheader

    import parserheader
    
    ...

    def setHeaders():
        ph = parserheader.parserheader()
        header_str = """
            POST /upload/ HTTP/1.1
            Host: google.com.com
            Connection: keep-alive
            Content-Length: 1220
            Cache-Control: max-age=0
            Origin: http://www.google.com.com
            Upgrade-Insecure-Requests: 1
            Content-Type: application/x-www-form-urlencoded
            User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36
            Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
            Referer: http://www.google.com/
            Accept-Encoding: gzip, deflate
            Accept-Language: en-US,en;q=0.9,id;q=0.8
            Cookie: PHPSESSID=41a0f0ac4545d3f5ba9a4ba415b777e9
        """
        headers = ph.parserHeader(header_str)
        print("headers =", headers)
        return headers

    setHeaders()

    $ python test.py 
    headers = {'Origin': 'http://www.google.com', 'Content-Length': '1220', 'Accept-Language': 'en-US,en;q=0.9,id;q=0.8', 'Accept-Encoding': 'gzip, deflate', 'Connection': 'keep-alive', 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3', 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36', 'Host': 'google.com', 'Referer': 'http://www.google.com/', 'Cache-Control': 'max-age=0', 'Cookie': 'PHPSESSID=41a0f0ac4545d3f5ba9a4ba415b777e9', 'Upgrade-Insecure-Requests': '1', 'Content-Type': 'application/x-www-form-urlencoded'}