Now want to do an app, the login function need to log in to a web site, the site login is invisible with recaptcha, how to implement this part of the network request? I found that after the login to the site will be request a like the following link

https://www.google.com/recaptcha/api2/anchor? Ar=1 & amp; K=6 ldrb64uaaaaam - 4 wttjpq2z8dq6sbs14zha4wrm & amp; Co=aHR0cHM6Ly9mb3J1bXMuaHVhcmVuLnVzOjQ0Mw.. & Hl=en& V=oqtdXEs9TE9ZUAIhXNz5JBt_ & amp; Size=invisible& Cb=pfhpenqg8met

Ar 1
6 ldrb64uaaaaam - 4 k wttjpq2z8dq6sbs14zha4wrm
Co aHR0cHM6Ly9mb3J1bXMuaHVhcmVuLnVzOjQ0Mw..
En hl
V oqtdXEs9TE9ZUAIhXNz5JBt_
The size cause
Cb pfhpenqg8met

Then the return value and there will be a with recaptcha response, finally use the response combined with the user name and password is submitted to the website login API can login successfully, I can find out the value of k and v of the above request, but the co and the value of cb is where to find the

This web site has its own official app, the app is how to do this login
?
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