/**
   * The HTTP <a href="https://wicg.github.io/ua-client-hints/#sec-ch-ua-model">{@code
   * Sec-CH-UA-Model}</a> header field name.
   *
   * @since 30.0
   */
  public static final String SEC_CH_UA_MODEL = "Sec-CH-UA-Model";
  /**
   * The HTTP <a href="https://wicg.github.io/ua-client-hints/#sec-ch-ua-platform">{@code
   * Sec-CH-UA-Platform}</a> header field name.
   *

	req.Header = http.Header{}

	ua := "short-agent"
	req.Header.Set("User-Agent", ua)
	uaNotTruncated := &lazyTruncatedUserAgent{req}
	assert.Equal(t, ua, fmt.Sprintf("%v", uaNotTruncated))

	ua = ""
	for i := 0; i < maxUserAgentLength*2; i++ {
		ua = ua + "a"
	}
	req.Header.Set("User-Agent", ua)
	uaTruncated := &lazyTruncatedUserAgent{req}
	assert.NotEqual(t, ua, fmt.Sprintf("%v", uaTruncated))

  /**
   * The HTTP <a href="https://wicg.github.io/ua-client-hints/#sec-ch-ua-model">{@code
   * Sec-CH-UA-Model}</a> header field name.
   *
   * @since 30.0
   */
  public static final String SEC_CH_UA_MODEL = "Sec-CH-UA-Model";
  /**
   * The HTTP <a href="https://wicg.github.io/ua-client-hints/#sec-ch-ua-platform">{@code
   * Sec-CH-UA-Platform}</a> header field name.
   *

type lazyTruncatedUserAgent struct {
	req *http.Request
}

func (lazy *lazyTruncatedUserAgent) String() string {
	ua := "unknown"
	if lazy.req != nil {
		ua = utilnet.GetHTTPClient(lazy.req)
		if len(ua) > maxUserAgentLength {
			ua = ua[:maxUserAgentLength] + userAgentTruncateSuffix
		}
	}
	return ua
}

// LazyClientIP implements String() string and it will
// calls GetClientIP() lazily only when required.

func TestMaybeTruncateUserAgent(t *testing.T) {
	req := &http.Request{}
	req.Header = http.Header{}

	ua := "short-agent"
	req.Header.Set("User-Agent", ua)
	assert.Equal(t, ua, maybeTruncateUserAgent(req))

	ua = ""
	for i := 0; i < maxUserAgentLength*2; i++ {
		ua = ua + "a"
	}
	req.Header.Set("User-Agent", ua)
	assert.NotEqual(t, ua, maybeTruncateUserAgent(req))
}

func TestCopyWithoutManagedFields(t *testing.T) {

            if (entry.getKey().matcher(target).find()) {
                final Directive directive = entry.getValue();
                final String ua = directive.getUserAgent();
                int uaLength = 0;
                if (!ALL_BOTS.equals(ua)) {
                    uaLength = ua.length();
                }
                if (uaLength > maxUaLength) {
                    matchedDirective = directive;

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	}, nil
}

// truncate User-Agent if too long, otherwise return it directly.
func maybeTruncateUserAgent(req *http.Request) string {
	ua := req.UserAgent()
	if len(ua) > maxUserAgentLength {
		ua = ua[:maxUserAgentLength] + userAgentTruncateSuffix
	}

	return ua
}

// copyWithoutManagedFields will make a deep copy of the specified object and
// will discard the managed fields from the copy.

// if extended is true, it also updates the cosequence Ua, Ub.
func euclidUpdate(A, B, Ua, Ub, q, r, s, t *Int, extended bool) {
	q, r = q.QuoRem(A, B, r)

	*A, *B, *r = *B, *r, *A

	if extended {
		// Ua, Ub = Ub, Ua - q*Ub
		t.Set(Ub)
		s.Mul(Ub, q)
		Ub.Sub(Ua, s)
		Ua.Set(t)
	}
}

// lehmerGCD sets z to the greatest common divisor of a and b,

        ImmutableBiMap.<String, String>builder()
            .put("CDN_LOOP", "CDN-Loop")
            .put("ETAG", "ETag")
            .put("SOURCE_MAP", "SourceMap")
            .put("SEC_CH_UA_WOW64", "Sec-CH-UA-WoW64")
            .put("SEC_WEBSOCKET_ACCEPT", "Sec-WebSocket-Accept")
            .put("SEC_WEBSOCKET_EXTENSIONS", "Sec-WebSocket-Extensions")
            .put("SEC_WEBSOCKET_KEY", "Sec-WebSocket-Key")