Function matchHeaders

modules/caddyhttp/matchers.go:1041–1082

matchHeaders returns true if input matches the criteria in against without regex. The host parameter should be obtained from the http.Request.Host field since net/http removes it from the header map.

(input, against http.Header, host string, transferEncoding []string, repl *caddy.Replacer)

// The host parameter should be obtained from the http.Request.Host field since
// net/http removes it from the header map.
func matchHeaders(input, against http.Header, host string, transferEncoding []string, repl *caddy.Replacer) bool {
	for field, allowedFieldVals := range against {
		actualFieldVals := getHeaderFieldVals(input, field, host, transferEncoding)
		if allowedFieldVals != nil && len(allowedFieldVals) == 0 && actualFieldVals != nil {
			// a non-nil but empty list of allowed values means
			// match if the header field exists at all
			continue
		}
		if allowedFieldVals == nil && actualFieldVals == nil {
			// a nil list means match if the header does not exist at all
			continue
		}
		var match bool
	fieldVals:
		for _, actualFieldVal := range actualFieldVals {
			for _, allowedFieldVal := range allowedFieldVals {
				if repl != nil {
					allowedFieldVal = repl.ReplaceAll(allowedFieldVal, "")
				}
				switch {
				case allowedFieldVal == "*":
					match = true
				case strings.HasPrefix(allowedFieldVal, "*") && strings.HasSuffix(allowedFieldVal, "*"):
					match = strings.Contains(actualFieldVal, allowedFieldVal[1:len(allowedFieldVal)-1])
				case strings.HasPrefix(allowedFieldVal, "*"):
					match = strings.HasSuffix(actualFieldVal, allowedFieldVal[1:])
				case strings.HasSuffix(allowedFieldVal, "*"):
					match = strings.HasPrefix(actualFieldVal, allowedFieldVal[:len(allowedFieldVal)-1])
				default:
					match = actualFieldVal == allowedFieldVal
				}
				if match {
					break fieldVals
				}
			}
		}
		if !match {
			return false
		}
	}
	return true
}

// CaddyModule returns the Caddy module information.
func (MatchHeaderRE) CaddyModule() caddy.ModuleInfo {