New features

• Tengine supports DTLSv1 and DTLSv1.2.

• Prometheus format and additional json properties was added to ngx_http_upstream_check_module.

• dubbo_pass directive can use the variables.

Changes with Tengine 2.3.3

Changes with Tengine 2.3.3                                         25 Mar 2021

    *) Feature: tengine supports DTLSv1 and DTLSv1.2. (mrpre)
    *) Feature: prometheus format and additional json properties was added to 
       ngx_http_upstream_check_module. (dkrutsko)
    *) Feature: the "dubbo_pass" directive can use the variables. (spacewander)
    *) Change: all features of nginx-1.18.0 are inherited, i.e.,  
       it is 100% compatible with nginx. (lianglli)
    *) Change: dingtalk user group was added to README. (cnmade)
    *) Change: format document of the mod_dubbo. (spacewander)
    *) Bugfix: int32 values are not decoded properly in the mod_dubbo. (spacewander)
    *) Bugfix: a segmentation fault might occur in a worker process when decoding 
       a dubbo payload with integer value in the mod_dubbo. (spacewander) 
    *) Bugfix: memory leak in ngx_http_lua_module with debug log. (hawkxiang)
    *) Bugfix: fake request was not freed in the ngx_multi_upstream_module. (spacewander)
    *) Bugfix: shared memory mutex in the ngx_http_upstream_check_module. (scriptkids)
    *) Bugfix: redundant upstream health check was removed in the 
       ngx_http_upstream_check_module. (scriptkids)
    *) Bugfix: duplicate log_ctx was deleted in the ngx_multi_upstream_module. (spacewander)
    *) Bugfix: tengine hogged CPU during reading message in the ngx_http_upstream_dyups_module 
       and when upstream check was used. (zjd87)
    *) Bugfix: ngx_http_upstream_vnswrr_module did not support "dynamic_resolve" directive. (wangfakang)
    *) Bugfix: "limit_req_zone" directive were used in multiple variables. (wangfakang)
    *) Bugfix ix: a segmentation fault might occur in a master process. (wangfakang)
    *) Bugfix: memory leak when rewrite string contains ASCII 0 character. (hongxiaolong)
    *) Bugfix: variable hex_str was not used in the mod_dubbo. (Weiliang-Li)
    *) Bugfix: keep-alive request did not transferred complete caused the 400 response. (fishgege)