text: Title: Option to not pretty print the response
  Body: I'm hitting `http://httpbin.org/headers` and am receiving this JSON back:
  ```json
  {
    "headers": {
      "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", 
      "Accept-Encoding": "gzip, deflate", 
      "Accept-Language": "en-US,en;q=0.5", 
      "Host": "httpbin.org", 
      "Upgrade-Insecure-Requests": "1", 
      "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0"
    }
  }
  ```
  
  I'd like an option to receive the response back without pretty printing:
  ```json
  {"headers":{"Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8","Accept-Encoding":"gzip, deflate","Accept-Language":"en-US,en;q=0.5","Host":"httpbin.org","Upgrade-Insecure-Requests":"1","User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0"}}
  ```
  
  Maybe via a query parameter like `?pretty=false`?