环境: set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*
读写当前请求的响应状态码。这个方法需要在发送响应头前调用。
ngx.status = ngx.HTTP_CREATED
status = ngx.status在发送响应头之后设置 ngx.status 不会生效，且 nginx 的错误日志中会有下面一条记录：
attempt to set ngx.status after sending out response headers
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context: set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*
Read and write the current request's response status. This should be called before sending out the response headers.
ngx.status = ngx.HTTP_CREATED
status = ngx.statusSetting ngx.status after the response header is sent out has no effect but leaving an error message in your nginx's error log file:
attempt to set ngx.status after sending out response headers