Rails: redirect_to in ajax request

gistfile1.txt

POST /machines HTTP/1.1
Host: localhost:3000
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0
Accept: */*;q=0.5, text/javascript, application/javascript, application/ecmascript, application/x-ecmascript
Accept-Language: pt-BR,pt;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
X-CSRF-Token: ZGycdXyHsJMo0jpmmGhQRsTZheMgq0ZIJ2rSPC6Iw8N6+h7triN6zg5h9Kgh7yZXFDCuLtACYY3nBN74xK28FA==
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://localhost:3000/calls/new
Content-Length: 179
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Connection: keep-alive

HTTP/1.1 302 Found 
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Location: http://localhost:3000/machines/8
Content-Type: text/html; charset=utf-8
Cache-Control: no-cache
X-Request-Id: fe2540d3-f064-4674-99a2-373c77f9f0bd
X-Runtime: 0.159745
Server: WEBrick/1.3.1 (Ruby/2.2.3/2015-08-18)
Date: Sat, 19 Dec 2015 13:39:54 GMT
Content-Length: 98
Connection: Keep-Alive
Set-Cookie: request_method=POST; path=/
_sinfsis_session=aVNURmUzWWNoZ0tOYzFwczhDays0MlFmNzUwWkhRU3dKSmhEeVp5TlFUMXZnMmlGSnI5QmhlN1NON0dPdW5HUDJ1SU5QeFl1OEc4ZTBlcGs1bFRhN3FzR0dQTms5ZGI5SHdxSzdZbHFkQUpOQTBiVFg0YXhhVVVPeTlnb2xnUlo1UTZUWTgrc20xcFpvT3NwQTF1RjNHSGkrTkh6S2hyQVRBWmJYTngyN2J4cmRicHhPS0xNTk5SL3dKVkdqSkEyeXVVM3FBamZTdlA2L2hzSzNnazJjV3ZpMzV5NDVmZ2dEb1JBa2RWVDd3dz0tLVpReDl2cDNBS2REYVNHVlpXRnRtV3c9PQ%3D%3D--63fcbaf3a830ce2aa1a0c9525f10e6619597d580; path=/; HttpOnly

GET /machines/8 HTTP/1.1
Host: localhost:3000
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0
Accept: */*;q=0.5, text/javascript, application/javascript, application/ecmascript, application/x-ecmascript
Accept-Language: pt-BR,pt;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://localhost:3000/calls/new
X-Requested-With: XMLHttpRequest
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-CSRF-Token: ZGycdXyHsJMo0jpmmGhQRsTZheMgq0ZIJ2rSPC6Iw8N6+h7triN6zg5h9Kgh7yZXFDCuLtACYY3nBN74xK28FA==
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Connection: keep-alive

HTTP/1.1 200 OK 
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Content-Type: text/javascript; charset=utf-8
Etag: W/"a5aed6561f2cd36d9f345e33ef9b029d"
Cache-Control: max-age=0, private, must-revalidate
X-Request-Id: b93e5431-c9be-41a8-bb4f-08259bf9e8aa
X-Runtime: 0.018285
Server: WEBrick/1.3.1 (Ruby/2.2.3/2015-08-18)
Date: Sat, 19 Dec 2015 13:39:54 GMT
Content-Length: 300
Connection: Keep-Alive
Set-Cookie: _sinfsis_session=S0o5YTRqSlcxMEJDR0FPc3RwNnU2blJIdmFWSnIvN1FNN1FaM1dZaHVXbHpaZkxMSjhxTVRMRE9OQTl0N0JYTFNlRjBjT3JkWFhsU3p6eVFrQkdCR1o2dFpVTWFQUkVUVU1sT3ZmTHlVOXY5YVdLWDJHL1JsZ0hYSHFPeGM5K3lES3IwaUFvTWJLQzBMaEM3d0prSm5pbEtPamROczZYWG55OFFIS0lRK1RmWWZxaFZtNURMMXd6dzRUcFJKeXJYcmd5RCsvQ2ZZN09ETk1UUGRSbUdIKzRxM1dmdFNERkY5VlVCZ1Zpa1AvMD0tLWJEa0FtVUJnYm9wZjg0WmdjYmhsVEE9PQ%3D%3D--6a8ac549c817fd4ac01122dcf5a27b054a60ba94; path=/; HttpOnly
request_method=; path=/; max-age=0; expires=Thu, 01 Jan 1970 00:00:00 -0000