解决了吗？我也是这种问题

client_header_buffer_size 16k
我设置了这个后出现404了

http {

include       mime.types;
default_type  application/octet-stream;

#log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
#                  '$status $body_bytes_sent "$http_referer" '
#                  '"$http_user_agent" "$http_x_forwarded_for"';

#access_log  logs/access.log  main;

sendfile        on;
#tcp_nopush     on;

#keepalive_timeout  0;
keepalive_timeout  65;

client_header_buffer_size 16K;
large_client_header_buffers 4 64K;
client_body_buffer_size  512k;
client_max_body_size 10m;
      
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header REMOTE-HOST $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

proxy_connect_timeout    300;
proxy_read_timeout       300; 
proxy_send_timeout       300;
proxy_buffer_size        32k; 
proxy_buffers            4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k; 
proxy_headers_hash_max_size 51200;
proxy_headers_hash_bucket_size 6400;
gzip  on;

server {
    listen    80;
            server_name localhost test.jsh178.com;
    #       index index.html index.htm;
    #       rewrite ^(.*) https://$host$1 permanent;
            access_log   off;
            location / {
              proxy_next_upstream http_502 http_504 error timeout invalid_header;
              proxy_set_header X-Forwarded-For $http_x_forwarded_for;
              proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
              proxy_set_header X-Real-IP $remote_addr;
              proxy_set_header Host $Host;
              proxy_pass http://127.0.0.1:8080;
              error_page 404 = /404.html;
            }
    }

HTTPS server

#
server {
    listen 443;
    server_name test.jsh178.com; 
    ssl on;
    ssl_certificate 1_test.jsh178.com_bundle.crt;
    ssl_certificate_key 2_test.jsh178.com.key;
    ssl_session_timeout 5m;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2; 
    ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE;
    ssl_prefer_server_ciphers on;
    location / {
             proxy_next_upstream http_502 http_504 error timeout invalid_header;
             proxy_set_header X-Forwarded-For $http_x_forwarded_for;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header Host $Host;
             proxy_pass http://127.0.0.1:8080;
             error_page 404 = /404.html;
  }
}

这个是我的Nginx的配置

贴出你的配置会让问题的解决变得更加有效率。