httpclient extraHeaders not working

[demian]

I'm trying to execute a simple request adding some headers but it fails with 
time-out. Here's my test code:
    
    
    import httpclient
    
    const division :string = "\c\L"
    const userAgent = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 
(KHTML, like Gecko) Windows Chromium/51.0.2704.79 Chrome/51.0.2704.79 
Safari/537.36"
    const headers = "Accept-Language: en-US,en;q=0.8,es;q=0.6" & division & 
"Connection:keep-alive"
    const url = 
"https://duckduckgo.com/?q=site%3Anim-lang.org+extraHeaders&t=canonical&ia=web";
    
    var content:string = getContent(url, extraheaders = headers, userAgent = 
userAgent)
    
    

I'm compiling it with: 
    
    
    nim c -r -d:ssl request_test.nim
    

If I remove the _extraHeader_ parameter it works well OK. Any idea what's wrong?

Nim version: Nim Compiler Version 0.14.3 (2016-08-23) [Linux: amd64]