How to use the pycurl.CUSTOMREQUEST function in pycurl

def searchIP(self, query, pages, queue, STOP_ME):
        if self.API_TOKEN == None:
            print "please config your API_TOKEN"
            sys.exit()
        for page in range(1, pages+1):
            b = StringIO.StringIO()
            c = pycurl.Curl()
            c.setopt(pycurl.URL, "%s?query=%s&page=%s" % (self.API_URL, query, page))
            c.setopt(pycurl.WRITEFUNCTION, b.write)
            c.setopt(pycurl.FOLLOWLOCATION, 1)
            c.setopt(pycurl.CUSTOMREQUEST, "GET")
            c.setopt(pycurl.HTTPHEADER, ['Authorization: JWT %s' % self.API_TOKEN.encode()])
            c.perform()
            hosts = json.loads(b.getvalue())
            for host in hosts['matches']:
                queue.put(host["ip"])
        STOP_ME[0] = True

def send_REST_request(ip, port, object, key, value, force=False):
    try:
        response = StringIO()
        headers = ["Content-Type:application/json"]
        url = "http://%s:%s/%s?%s=%s" %(
            ip, port, object, 
            urllib.quote_plus(key), 
            urllib.quote_plus(value))
        if force:
            url += "&force"
        conn = pycurl.Curl()
        conn.setopt(pycurl.URL, url)
        conn.setopt(pycurl.HTTPHEADER, headers)
        conn.setopt(pycurl.CUSTOMREQUEST, "delete")
        conn.setopt(pycurl.WRITEFUNCTION, response.write)
        conn.perform()
        return response.getvalue()
    except:
        return None
# end def send_REST_request

# Set the request method through curl's irritating interface which makes
    # up names for almost every single method
    curl_options = {
        "GET": pycurl.HTTPGET,
        "POST": pycurl.POST,
        "PUT": pycurl.UPLOAD,
        "HEAD": pycurl.NOBODY,
    }
    custom_methods = set(["DELETE", "OPTIONS", "PATCH"])
    for o in curl_options.values():
        curl.setopt(o, False)
    if request.method in curl_options:
        curl.unsetopt(pycurl.CUSTOMREQUEST)
        curl.setopt(curl_options[request.method], True)
    elif request.allow_nonstandard_methods or request.method in custom_methods:
        curl.setopt(pycurl.CUSTOMREQUEST, request.method)
    else:
        raise KeyError('unknown method ' + request.method)

    # Handle curl's cryptic options for every individual HTTP method
    if request.method in ("POST", "PUT"):
        request_buffer = BytesIO(utf8(request.body))
        curl.setopt(pycurl.READFUNCTION, request_buffer.read)
        if request.method == "POST":
            def ioctl(cmd):
                if cmd == curl.IOCMD_RESTARTREAD:
                    request_buffer.seek(0)
            curl.setopt(pycurl.IOCTLFUNCTION, ioctl)
            curl.setopt(pycurl.POSTFIELDSIZE, len(request.body))
        else:
            curl.setopt(pycurl.INFILESIZE, len(request.body))

def get_page_data(url, head = None, curl = None):
    stream_buffer = StringIO()
    if not curl:
        curl = pycurl.Curl()
    curl.setopt(pycurl.URL, url)#curl doesn't support unicode
    if head:
        curl.setopt(pycurl.HTTPHEADER,  head)#must be list, not dict
    curl.setopt(pycurl.WRITEFUNCTION, stream_buffer.write)
    curl.setopt(pycurl.CUSTOMREQUEST,"GET")
    curl.setopt(pycurl.CONNECTTIMEOUT, 30)
    curl.setopt(pycurl.TIMEOUT, 30)
    curl.setopt(pycurl.SSL_VERIFYPEER, 0)
    curl.setopt(pycurl.SSL_VERIFYHOST, 0)
    curl.perform()
    page_data =stream_buffer.getvalue()
    stream_buffer.close()
    return page_data

# Set the request method through curl's irritating interface which makes
        # up names for almost every single method
        curl_options = {
            "GET": pycurl.HTTPGET,
            "POST": pycurl.POST,
            "PUT": pycurl.UPLOAD,
            "HEAD": pycurl.NOBODY,
        }
        custom_methods = set(["DELETE", "OPTIONS", "PATCH"])
        for o in curl_options.values():
            curl.setopt(o, False)
        if request.method in curl_options:
            curl.unsetopt(pycurl.CUSTOMREQUEST)
            curl.setopt(curl_options[request.method], True)
        elif request.allow_nonstandard_methods or request.method in custom_methods:
            curl.setopt(pycurl.CUSTOMREQUEST, request.method)
        else:
            raise KeyError("unknown method " + request.method)

        body_expected = request.method in ("POST", "PATCH", "PUT")
        body_present = request.body is not None
        if not request.allow_nonstandard_methods:
            # Some HTTP methods nearly always have bodies while others
            # almost never do. Fail in this case unless the user has
            # opted out of sanity checks with allow_nonstandard_methods.
            if (body_expected and not body_present) or (
                body_present and not body_expected
            ):
                raise ValueError(
                    "Body must %sbe None for method %s (unless "
                    "allow_nonstandard_methods is true)"
                    % ("not " if body_expected else "", request.method)

else:
            curl.setopt(pycurl.IPRESOLVE, pycurl.IPRESOLVE_WHATEVER)

        # Set the request method through curl's irritating interface which makes
        # up names for almost every single method
        curl_options = {
            "GET": pycurl.HTTPGET,
            "POST": pycurl.POST,
            "PUT": pycurl.UPLOAD,
            "HEAD": pycurl.NOBODY,
        }
        custom_methods = set(["DELETE", "OPTIONS", "PATCH"])
        for o in curl_options.values():
            curl.setopt(o, False)
        if request.method in curl_options:
            curl.unsetopt(pycurl.CUSTOMREQUEST)
            curl.setopt(curl_options[request.method], True)
        elif request.allow_nonstandard_methods or request.method in custom_methods:
            curl.setopt(pycurl.CUSTOMREQUEST, request.method)
        else:
            raise KeyError('unknown method ' + request.method)

        # Handle curl's cryptic options for every individual HTTP method
        if request.method == "GET":
            if request.body is not None:
                raise ValueError('Body must be None for GET request')
        elif request.method in ("POST", "PUT") or request.body:
            if request.body is None:
                raise ValueError(
                    'Body must not be None for "%s" request'
                    % request.method)

def makeRequest(ignored):
            curl = CurlRequestDriver.curl
            curl.reset()

            curl.setopt(pycurl.URL, url)
            curl.setopt(pycurl.HEADERFUNCTION, self.receiveHeaders)
            curl.setopt(pycurl.WRITEFUNCTION, self.buffer.write)

            curl.setopt(pycurl.CUSTOMREQUEST, method)

            if body is not None:
                curl.setopt(pycurl.POSTFIELDS, body)

            headers = []
            for key, value in self.headers.iteritems():
                headers.append("{}: {}".format(key, value))
            curl.setopt(pycurl.HTTPHEADER, headers)

            d = threads.deferToThread(curl.perform)
            d.addCallback(self.receive)
            return d

def send_REST_request(ip, port, payload, file_name):
    try:
        response = StringIO()
        headers = ["Content-Type:application/json"]
        url = "http://%s:%s/image/upload" %(
            ip, port)
        conn = pycurl.Curl()
        conn.setopt(pycurl.URL, url)
        conn.setopt(pycurl.HTTPHEADER, headers)
        conn.setopt(pycurl.POST, 1)
        #conn.setopt(pycurl.POSTFIELDS, '%s'%json.dumps(payload))
        conn.setopt(pycurl.HTTPPOST, payload)
        #conn.setopt(pycurl.HTTPPOST, [("file_name", (pycurl.FORM_FILE, file_name))])
        conn.setopt(pycurl.CUSTOMREQUEST, "PUT")
        conn.setopt(pycurl.WRITEFUNCTION, response.write)
        conn.perform()
        return response.getvalue()
    except:
        return None

def load(self, *args, **kwargs):
        post = kwargs.get("post")
        if post is None:
            if len(args) > 2:
                post = args[2]
        if post:
            self.http.c.setopt(pycurl.FOLLOWLOCATION, 0)
            self.http.c.setopt(pycurl.POST, 1)
            self.http.c.setopt(pycurl.CUSTOMREQUEST, "POST")
        else:
            self.http.c.setopt(pycurl.FOLLOWLOCATION, 1)
            self.http.c.setopt(pycurl.POST, 0)
            self.http.c.setopt(pycurl.CUSTOMREQUEST, "GET")
        return Browser.load(self, *args, **kwargs)

self.curl.setopt(pycurl.WRITEFUNCTION, self.result.write)
        self.curl.setopt(pycurl.HEADERFUNCTION, self.result_headers.write)
        # We want to use gzip and deflate if possible:
        self.curl.setopt(pycurl.ENCODING, "") # use all available encodings
        self.curl.setopt(pycurl.URL, self.url)

        # let's set the HTTP request method
        if method == 'GET':
            self.curl.setopt(pycurl.HTTPGET, 1)
        elif method == 'POST':
            self.curl.setopt(pycurl.POST, 1)
        elif method == 'PUT':
            self.curl.setopt(pycurl.UPLOAD, 1)
        else:
            self.curl.setopt(pycurl.CUSTOMREQUEST, method)
        if data:
            if method == "PUT":
                self.data = StringIO.StringIO(data)
                self.curl.setopt(pycurl.READFUNCTION, self.data.read)
                self.curl.setopt(pycurl.INFILESIZE, len(self.data.getvalue()))
            else:
                self.curl.setopt(pycurl.POSTFIELDS, self.data)
                self.curl.setopt(pycurl.POSTFIELDSIZE, len(self.data))
        if headers:
            self.curl.setopt(pycurl.HTTPHEADER, headers)
        if headers_only:
            self.curl.setopt(pycurl.HEADER, 1)
            self.curl.setopt(pycurl.NOBODY, 1)
        if user_agent:
            self.curl.setopt(pycurl.USERAGENT, user_agent)
        if follow_location: