Submit a form using POST with g-recaptcha-response argument

Question

I want to submit a form from following web page: http://www.hzzo-net.hr/statos_OIB.htm

First, I use 2captcha service to bypass recaptcha:

# parameter         


        

Answer 1

If you inspect the HTML you'll see that the form's action is ../cgi-bin/statos_OIB.cgi, which means that the form is submitted to http://www.hzzo-net.hr/cgi-bin/statos_OIB.cgi, so you must use that URL.

Also, after some testing I discovered that the server returns a 500 response, unless a valid Referer (http://www.hzzo-net.hr/statos_OIB.htm) is provided.

I'm not familiar with R, but I can provide an example in Python, using the requests library.

import requests

url = "http://www.hzzo-net.hr/cgi-bin/statos_OIB.cgi"
hzzo_response = 'your token'
data = {
    'upoib': '93335620125', 
    'g-recaptcha-response': hzzo_response
}
headers = {'referer': 'http://www.hzzo-net.hr/statos_OIB.htm'}
r = requests.post(url, data=data, headers=headers)
html = r.text

print(html)

---

After studying the httr docs I managed to 'translate' the above code in R. The code produces correct results if a valid token is supplied.

library(httr)

url <- "http://www.hzzo-net.hr/cgi-bin/statos_OIB.cgi"
hzzo_response <- "your token"
parameters <- list(
  'upoib' = "93335620125", 
  'g-recaptcha-response' = hzzo_response
)
test <- POST(
  url,
  body = parameters, 
  add_headers(Referer = 'http://www.hzzo-net.hr/statos_OIB.htm'),
  encode = "form",
  verbose()
)
html <- content(test, 'text', encoding = 'UTF-8')

print(html)