modules/proxy/ajp_header.c:650: error: INTEGER_OVERFLOW_L2
  ([0, +oo] - 4):unsigned64 by call to `ajp_ilink_send`.

modules/proxy/ajp_header.c:643:10: Call
641.     }
642. 
643.     rc = ajp_marshal_into_msgb(msg, r, uri);
              ^
644.     if (rc != APR_SUCCESS) {
645.         ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00988)

modules/proxy/ajp_header.c:246:9: Call
  244.     ajp_msg_reset(msg);
  245. 
  246.     if (ajp_msg_append_uint8(msg, CMD_AJP13_FORWARD_REQUEST)     ||
               ^
  247.         ajp_msg_append_uint8(msg, (apr_byte_t) method)           ||
  248.         ajp_msg_append_string(msg, r->protocol)                  ||

modules/proxy/ajp_msg.c:306:1: Parameter `*msg->buf`
    304.  * @return          APR_SUCCESS or error
    305.  */
    306. apr_status_t ajp_msg_append_uint8(ajp_msg_t *msg, apr_byte_t value)
         ^
    307. {
    308.     apr_size_t len = msg->len;

modules/proxy/ajp_header.c:650:10: Call
648.     }
649. 
650.     rc = ajp_ilink_send(sock, msg);
              ^
651.     ajp_msg_log(r, msg, "ajp_send_header: ajp_ilink_send packet dump");
652.     if (rc != APR_SUCCESS) {

modules/proxy/ajp_link.c:21:1: Parameter `msg->len`
  19. APLOG_USE_MODULE(proxy_ajp);
  20. 
  21. apr_status_t ajp_ilink_send(apr_socket_t *sock, ajp_msg_t *msg)
      ^
  22. {
  23.     char         *buf;

modules/proxy/ajp_link.c:27:5: Call
  25.     apr_size_t   length;
  26. 
  27.     ajp_msg_end(msg);
          ^
  28. 
  29.     length = msg->len;

modules/proxy/ajp_msg.c:223:1: <LHS trace>
221.  * @return          APR_SUCCESS or error
222.  */
223. apr_status_t ajp_msg_end(ajp_msg_t *msg)
     ^
224. {
225.     apr_size_t len = msg->len - AJP_HEADER_LEN;

modules/proxy/ajp_msg.c:223:1: Parameter `msg->len`
    221.  * @return          APR_SUCCESS or error
    222.  */
    223. apr_status_t ajp_msg_end(ajp_msg_t *msg)
         ^
    224. {
    225.     apr_size_t len = msg->len - AJP_HEADER_LEN;

modules/proxy/ajp_msg.c:225:5: Binary operation: ([0, +oo] - 4):unsigned64 by call to `ajp_ilink_send` 
    223. apr_status_t ajp_msg_end(ajp_msg_t *msg)
    224. {
    225.     apr_size_t len = msg->len - AJP_HEADER_LEN;
             ^
    226. 
    227.     if (msg->server_side) {
