webman nginx配置 /访问静态目录，/api访问webman，怎么配置nginx

upstream webman {
    server 127.0.0.1:8787;
    keepalive 10240;
}

server {
  server_name webman.v3.com;
  listen 80;
  access_log off;

  location /api/ {
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header Host $host;
      proxy_http_version 1.1;
      proxy_set_header Connection "";
      if (!-f $request_filename){
          proxy_pass http://webman;
      }
  }

    location / {
        root /frontend/webman;
    }
}

proxy_pass http://webman;

proxy_pass http://webman/;

location /api/ {
    proxy_pass http://127.0.0.1:8080/;
    proxy_set_header Host $http_host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}

location / {
    root /frontend/webman;
}