Log or output each tHttpRequest with variable

[Anonymous]

Hi

I am troubleshooting a small job with tHttpRequest performing multiple post actions from a list extracted from our active directory. 

I am receiving an error message in the execution console:

400 Bad Request
{"error":{"message":"(#100) Please enter a valid email address.","type":"OAuthException","code":100,"site_id":"E6IUnY\/XXX"}}" 

I have probably configured my parameter wrong with the post operation.
How can I setup a verbose output so I can see all my post operations? 

This is the URL: "https://graph.facebook.com/GROUP_ID/members?email=+mail"

Is this the correct way to use a variable? +mail? 

[TRF]

Regarding the syntax, it should be better with:
" https://graph.facebook.com/GROUP_ID/members?email="+row2.mail
I suppose mail is a field of row2 flow.

[Anonymous]

Great, thank you very much!

I though I was using the latest transformed value of mail since I am URL encoding it with tReplace.

But the question still remains, how can I somehow see or output a log for each tHttpRequest? 

The option "Write response content to file" only outputs successful responses.