[GH-ISSUE #2596] [Feature Request] 客户端没有连接时，访问能否报503错误，而非404

gitea-mirror commented

2026-05-05 13:19:55 -06:00

Owner

Originally created by @m2276699 on GitHub (Sep 30, 2021).
Original GitHub issue: https://github.com/fatedier/frp/issues/2596

Describe the feature request

需求：做http转发时，nginx识别500错误时，需转发到其他可用服务
现状：当客户端没有连接时，frp返回的状态码是404，nginx无法转到备用服务器。
虽然可以识别404后转发到备用服务器，但是很多情况下都不现实，毕竟外网http服务经常被扫描，404多了就直接到备用服务器了。

Describe alternatives you've considered

当客户端没有连接时，frp返回的状态码是503

Affected area

Docs
Installation
Performance and Scalability
Security
User Experience
Test and Release
Developer Infrastructure
Client Plugin
Server Plugin
Extensions
Others

Originally created by @m2276699 on GitHub (Sep 30, 2021). Original GitHub issue: https://github.com/fatedier/frp/issues/2596 ### Describe the feature request 需求：做http转发时，nginx识别500错误时，需转发到其他可用服务现状：当客户端没有连接时，frp返回的状态码是404，nginx无法转到备用服务器。虽然可以识别404后转发到备用服务器，但是很多情况下都不现实，毕竟外网http服务经常被扫描，404多了就直接到备用服务器了。 ### Describe alternatives you've considered 当客户端没有连接时，frp返回的状态码是503 ### Affected area - [ ] Docs - [ ] Installation - [ ] Performance and Scalability - [ ] Security - [ ] User Experience - [ ] Test and Release - [ ] Developer Infrastructure - [ ] Client Plugin - [ ] Server Plugin - [ ] Extensions - [X] Others

gitea-mirror closed this issue

2026-05-05 13:19:56 -06:00

gitea-mirror commented

2026-05-05 13:19:58 -06:00

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Owner

@blizard863 commented on GitHub (Oct 8, 2021):

提供下配置。

@blizard863 commented on GitHub (Oct 8, 2021): 提供下配置。

gitea-mirror commented

2026-05-05 13:19:58 -06:00

Author

Owner

@m2276699 commented on GitHub (Oct 10, 2021):

nginx

server {
    listen       80;
    server_name  x.abc.com;

    location / {
        proxy_set_header  X-Real-IP  $remote_addr;
        proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header  Host $http_host;
        proxy_redirect off;
        proxy_read_timeout 300;
        proxy_pass http://127.0.0.1:2080/;
    }
}

frps.ini

[common]
bind_addr = 0.0.0.0
bind_port = 7879
bind_udp_port = 7880
kcp_bind_port = 7879
vhost_http_port = 2080
vhost_https_port = 20443
log_file = ./frps.log
log_level = info
log_max_days = 3
token = xxxxxx
max_pool_count = 50
authentication_timeout = 300
tcp_mux = true
custom_404_page = /mnt/frp/404.html

此时frpc没有启动。当访问x.abc.com时，frps返回的状态码是404，希望是503

@m2276699 commented on GitHub (Oct 10, 2021): nginx ``` server { listen 80; server_name x.abc.com; location / { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_read_timeout 300; proxy_pass http://127.0.0.1:2080/; } } ``` frps.ini ``` [common] bind_addr = 0.0.0.0 bind_port = 7879 bind_udp_port = 7880 kcp_bind_port = 7879 vhost_http_port = 2080 vhost_https_port = 20443 log_file = ./frps.log log_level = info log_max_days = 3 token = xxxxxx max_pool_count = 50 authentication_timeout = 300 tcp_mux = true custom_404_page = /mnt/frp/404.html ``` 此时frpc没有启动。当访问x.abc.com时，frps返回的状态码是404，希望是503

gitea-mirror commented

2026-05-05 13:20:00 -06:00

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Owner

@fatedier commented on GitHub (Oct 11, 2021):

目前不太可能改成返回 503，含义和目前不是很匹配，frp 的服务端并不知道后端的服务是不可用还是不存在。

建议看是否能有其他的方式才判断是否重试。

@fatedier commented on GitHub (Oct 11, 2021): 目前不太可能改成返回 503，含义和目前不是很匹配，frp 的服务端并不知道后端的服务是不可用还是不存在。建议看是否能有其他的方式才判断是否重试。