利用nginx解决跨域问题的方法（以flask为例）

from flask import Flask
app = Flask(__name__)
@app.route('/') def hello_world(): return 'this is client'
if __name__ == '__main__':
 app.run(port=5000)

from flask import Flask
app = Flask(__name__)
@app.route('/') def hello_world(): return 'this is server' @app.route('/api/') def api(): return 'api'
if __name__ == '__main__':
 app.run(port=5001)

sudo gedit /etc/nginx/sites-available/default

## demo listen 5017 proxy 5000 and 5001 ##
server {
 listen 5017; 
 server_name a.xxx.com;
 access_log /var/log/nginx/a.access.log;
 error_log /var/log/nginx/a.error.log;
 root html;
 index index.html index.htm index.php;
 ## send request back to flask ##
 location / {
  proxy_pass http://127.0.0.1:5000/ ; 
 #Proxy Settings
  proxy_redirect off;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
  proxy_max_temp_file_size 0;
  proxy_connect_timeout 90;
  proxy_send_timeout 90;
  proxy_read_timeout 90;
  proxy_buffer_size 4k;
  proxy_buffers 4 32k;
  proxy_busy_buffers_size 64k;
 }
 location /proxy {
  rewrite ^.+proxy/?(.*)$ /$1 break;
  proxy_pass http://127.0.0.1:5001/ ; 
 #Proxy Settings
  proxy_redirect off;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
  proxy_max_temp_file_size 0;
  proxy_connect_timeout 90;
  proxy_send_timeout 90;
  proxy_read_timeout 90;
  proxy_buffer_size 4k;
  proxy_buffers 4 32k;
  proxy_busy_buffers_size 64k;
 }
}
## End a.xxx.com ##

sudo /etc/init.d/nginx restart