Method NegotiateFormat

context.go:1394–1422

NegotiateFormat returns an acceptable Accept format.

(offered ...string)

// NegotiateFormat returns an acceptable Accept format.
func (c *Context) NegotiateFormat(offered ...string) string {
	assert1(len(offered) > 0, "you must provide at least one offer")

	if c.Accepted == nil {
		c.Accepted = parseAccept(c.requestHeader("Accept"))
	}
	if len(c.Accepted) == 0 {
		return offered[0]
	}
	for _, accepted := range c.Accepted {
		for _, offer := range offered {
			// According to RFC 2616 and RFC 2396, non-ASCII characters are not allowed in headers,
			// therefore we can just iterate over the string without casting it into []rune
			i := 0
			for ; i < len(accepted) && i < len(offer); i++ {
				if accepted[i] == '*' || offer[i] == '*' {
					return offer
				}
				if accepted[i] != offer[i] {
					break
				}
			}
			if i == len(accepted) {
				return offer
			}
		}
	}
	return ""
}

// SetAccepted sets Accept header data.
func (c *Context) SetAccepted(formats ...string) {