Convert curl command to BIG-IP Monitor Send String

Problem this snippet solves:

Convert curl commands into a HTTP or HTTPS monitor Send String.

How to use this snippet:

Save this code into a Python script and run as a replacement for curl.

Related Article: How to create custom HTTP monitors with Postman, curl, and Python

An example would be:

% python curl_to_send_string.py -X POST -H "Host: api.example.com" -H "User-Agent: Custom BIG-IP Monitor" -H "Accept-Encoding: identity" -H "Connection: Close" -H "Content-Type: application/json" -d '{
  "hello":
      "world"
}
' "http://10.1.10.135:8080/post?show_env=1"
SEND STRING:
POST /post?show_env=1 HTTP/1.1\r\nHost: api.example.com\r\nUser-Agent: Custom BIG-IP Monitor\r\nAccept-Encoding: identity\r\nConnection: Close\r\nContent-Type: application/json\r\n\r\n{\n  \"hello\":\n      \"world\"\n}\n

Code :

Python 2.x

import getopt
import sys
import urllib

optlist, args = getopt.getopt(sys.argv[1:], 'X:H:d:')
flat_optlist = dict(optlist)

method = flat_optlist.get('-X','GET')

(host,uri) = urllib.splithost(urllib.splittype(args[0])[1])
protocol = 'HTTP/1.1'

headers = ["%s %s %s" %(method, uri, protocol)]
headers.extend([h[1] for h in optlist if h[0] == '-H'])
if not filter(lambda x: 'host:' in x.lower(),headers):
    headers.insert(1,'Host: %s' %(host))


send_string =  "\\r\\n".join(headers)
send_string += "\\r\\n\\r\\n"

if '-d' in flat_optlist:
    send_string += flat_optlist['-d'].replace('\n','\\n')
send_string = send_string.replace("\"", "\\\"")
print "SEND STRING:"
print send_string

Python 3.x

import getopt
import sys

from urllib.parse import splittype, urlparse

optlist, args = getopt.getopt(sys.argv[1:], 'X:H:d:')
flat_optlist = dict(optlist)

method = flat_optlist.get('-X','GET')

parts = urlparse(splittype(args[0])[1])
(host,uri) = (parts.hostname,parts.path)
protocol = 'HTTP/1.1'

headers = ["%s %s %s" %(method, uri, protocol)]
headers.extend([h[1] for h in optlist if h[0] == '-H'])
if not filter(lambda x: 'host:' in x.lower(),headers):
    headers.insert(1,'Host: %s' %(host))


send_string =  "\\r\\n".join(headers)
send_string += "\\r\\n\\r\\n"

if '-d' in flat_optlist:
    send_string += flat_optlist['-d'].replace('\n','\\n')
send_string = send_string.replace("\"", "\\\"")
print("SEND STRING:")
print(send_string)

Tested this on version:

11.5

Updated Jun 06, 2023
Version 3.0
BIG-IP
cloud
  • Danny_Arroyo's avatar
    Danny_Arroyo
    Icon for Cirrus rankCirrus
    Mar 27, 2017

    Eric,

     

    I just tried your script on v11.4.1 and it worked perfectly. Thanks!!!

     

  • Buddy_Edwards_1's avatar
    Buddy_Edwards_1
    Icon for Nimbostratus rankNimbostratus
    Sep 15, 2017

    I'd like to say first that this is a great piece of code that has saved me a lot of headaches so thank you for creating it. The original script runs great in Python2 but had need for it to run natively in Python3 as the interpreter. This is a modified version that works in Python3.

     

        Code

import getopt
import sys
from urllib.parse import splithost, splittype

optlist, args = getopt.getopt(sys.argv[1:], 'X:H:d:')
flat_optlist = dict(optlist)

method = flat_optlist.get('-X', 'GET')

(host, uri) = splithost(splittype(args[0])[1])
protocol = 'HTTP/1.1'

headers = ["%s %s %s" % (method, uri, protocol)]
headers.extend([h[1] for h in optlist if h[0] == '-H'])
if not fil`text`ter(lambda x: 'host:' in x.lower(), headers):
    headers.insert(1, 'Host: %s' % (host))

send_string = "\\r\\n".join(headers)
send_string += "\\r\\n\\r\\n"

if '-d' in flat_optlist:
    send_string += flat_optlist['-d'].replace('\n', '\\n')
send_string = send_string.replace("\"", "\\\"")
print("SEND STRING: " + send_string)
  • scyonix_360392's avatar
    scyonix_360392
    Icon for Nimbostratus rankNimbostratus
    May 03, 2018

    Hi I tried this but health monitoring is showing down, Logs says its a malformed request

     

    this is my curl command which works as expected:

     

    curl -X POST -H 'content-type: application/json' -H 'host: host.domain.com' -d '{"queryParam":"cleaning","start":"0","rows":"20","searchType":["ALL"],"facetSelection":["SC:catalogs"],"userRoles":[""]}'

     

    here is the equivalent send string created using the script which is not working:

     

    POST /globalSearch/basicSearch HTTP/1.1\r\ncontent-type: application/json\r\nhost: host.domain.com\r\n\r\n{\“queryParam\“:\“cleaning\“,\“start\“:\“0\“,\“rows\“:\“20\“,\“searchType\“:[\“ALL\“],\“facetSelection\“:[\“SC:catalogs\“],\“userRoles\“:[\“\”]}

     

    Can anyone find out what the issue is?

     

  • Eric_Chen's avatar
    Eric_Chen
    Icon for Employee rankEmployee
    May 03, 2018

    I wonder whether your web server is expecting a content-length. Try

    POST /globalSearch/basicSearch HTTP/1.1\r\ncontent-type: application/json\r\nhost: host.domain.com\r\nContent-Length: 120\r\n\r\n{\“queryParam\“:\“cleaning\“,\“start\“:\“0\“,\“rows\“:\“20\“,\“searchType\“:[\“ALL\“],\“facetSelection\“:[\“SC:catalogs\“],\“userRoles\“:[\“\”]}

  • Eric_Chen's avatar
    Eric_Chen
    Icon for Employee rankEmployee
    May 03, 2018

    In your curl example above was it http or https? Similar question about whether your monitor was configured to match the same protocol.

     

  • Eric_Chen's avatar
    Eric_Chen
    Icon for Employee rankEmployee
    May 03, 2018

    Weird. It looks fine. tcpdump could verify whether any differences. Sending to the same port?