http-headers Accept: (Request) text/html and application/xml with a preference text/html
Example
Request:"http://example.com"
GET / HTTP/1.1 Host: example.com User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0 Accept: text/html;q=1.0,application/xml;q=0.9 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Connection: keep-alive
The client will accept Content-Types of text/html and application/xml but it prefers text/html
