NGX_HTTP_IMAGE_PNG  423 http/modules/ngx_http_image_filter_module.c         return NGX_HTTP_IMAGE_PNG;
NGX_HTTP_IMAGE_PNG  697 http/modules/ngx_http_image_filter_module.c     case NGX_HTTP_IMAGE_PNG:
NGX_HTTP_IMAGE_PNG  995 http/modules/ngx_http_image_filter_module.c     case NGX_HTTP_IMAGE_PNG:
NGX_HTTP_IMAGE_PNG 1071 http/modules/ngx_http_image_filter_module.c     case NGX_HTTP_IMAGE_PNG: