serving web app and python using nginx on remote server - post

Question

Setup:
1> Web GUI using Angular JS hoasted in tomcat server and Python app using Flask is running on an AWS server.
2> I am working in a secure server hence am unable to access AWS directly.
3> I have setup NGINX to access GUI app from my local secured network. GUI app is running on awsserver:9506/appName
4> Flask app is running in AWS server hosted on 127.0.0.1:5000. This app has 2 uri's cross and accross:
127.0.0.1:5000/cross
127.0.0.1:5000/accross
Now in my GUI after NGINX setup i am able to access it using domain name and without port:
doman.name/appName
Now when i try to use it send a request to server my url changes to:
doman.name/cross. I did the changes in NGINX config and am able to access it but am not able to get a response back. Please find below my NGINX config file:
server {
listen 80;
server_name domain.name;
root /home/Tomcat/webapps/appName;
location / {
proxy_pass http://hostIP:9505/; #runs the tomcat home page
}
location /appName/ {
proxy_pass http://hostIP:9505/appName; #runs the application home page
}
location /cross/ {
proxy_pass http://127.0.0.1:5000/cross; #hits the python flask app and am trying to send post
}
}
Also what i noticed is that my POST request is being converted to GET at the server by NGINX

Answer 1

You need to be consistent with your use of the trailing /. With the proxy_pass statement (as with alias) nginx performs text substitution to form the rewritten URI.
Is the URI of the API /cross or /cross/? POST is converted to GET when the server is forced to perform a redirect (for example, to append a /).
Specifying the same URI on the location and proxy_pass is unnecessary as no changes are made.
If the hostIP in your first two location blocks is the same, and assuming that the missing trailing / is accidental, they can be combined into a single location block.
For example:
location / {
proxy_pass http://hostIP:9505;
}
location /cross {
proxy_pass http://127.0.0.1:5000;
}
See this document for more.