how to pass email as param to invoke url

I have custom function for my button

contDetails = zoho.crm.getRecordById("Contacts",contactId.toLong());

email = contDetails.get("Ryze_Username");

header_data = Map();

header_data.put("Content-Type","application/pdf");

file_object = invokeurl

[

url :"https://radiant-gorge-88984.herokuapp.com/reports/:email"

type :GET

headers: header_data

];

response = zoho.crm.attachFile("Contacts",contactId,file_object);

info file_object;

return response;

I do not get any error for this function.However, this function cannot send email to the url.

My expected url is https://radiant-gorge-88984.herokuapp.com/reports/example@gmail.com.

Moreover, can we use http://localhost:3000 in invoke url?

Thank you