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How to setup Nginx to display a website served by an internal Python server

I'm using Nginx as a reverse proxy for several web services and it works well, however, now I need to redirect the input to this server to display a website.
This web runs on an internal server, localhost:51000, and its main page is localhost:51000/login. The server runs under Python.
I would like to use an arbitrary URI to access this website from any computer but I'm not able to configure Nginx for this purpose. Needless to say, I have followed various examples and instructions found on the web and in the nginx documentation.
For example, using the following configuration:
server {
listen 443 ssl;
server_name myweb.com;
server_tokens off;
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
ssl_certificate ...;
ssl_certificate_key ...;
ssl_protocols TLSv1.2 TLSv1.3;
ssl_prefer_server_ciphers on;
ssl_ciphers ...
location / {
root html;
index index.html index.php;
}
location /vis2 {
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_set_header X-NginX-Proxy true;
rewrite ^/vis2(.*) /$1 break;
proxy_pass http://localhost:51000/login;
}
writing myweb.com/vis2 on a web browser the server redirects to https://myweb.com/login, and the result is a 404 code because it expects to find the login file in the root of myweb.com
Instead, if I use this other configuration:
location /vis1 {
rewrite ^/vis1(.*) /$1 break;
proxy_pass http://localhost:51000/login;
proxy_redirect off;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-NginX-Proxy true;
proxy_set_header X-Forwarded-Proto $scheme;
}
writing myweb.com/vis1 on a web browser the server redirects to https://localhost:51000/login, and this is not accessible from outside the server.
I wonder what am I doing wrong or maybe it is not possible. Any advice?
Thanks in advance

What is the correct connection string?

I have a couchbase server behind a NGINX reverse proxy (behind the subpath /db).
How do I specify the correct connection string in Python?
I tried
from couchbase.cluster import Cluster, ClusterOptions
from couchbase.auth import PasswordAuthenticator
cluster = Cluster('couchbase://testserver.com/db', ClusterOptions(
PasswordAuthenticator('Administrator', 'password')))
But I get
ValueError: Cannot pass bucket to connection string: db
Accessing the admin website at https://testserver.com/db/_utils/index.html works.
NGINX configuration:
server {
listen 80;
server_name testserver.com;
return 301 https://$server_name$request_uri;
}
server {
listen 443 ssl http2;
server_name stagingpos.rsj.de;
ssl_certificate /etc/ssl/xxx.crt;
ssl_certificate_key /etc/ssl/xxx.key;
location / {
proxy_pass http://127.0.0.1:8001;
proxy_set_header X-Forwarded-For $remote_addr;
}
location /db {
rewrite /db/(.*) /$1 break;
proxy_pass http://127.0.0.1:5984/;
proxy_redirect off;
proxy_buffering off;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Ssl on;
}
location /_session {
proxy_pass http://127.0.0.1:5984/_session;
proxy_redirect off;
proxy_buffering off;
proxy_set_header Host $host;
proxy_set_header X_Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded_Ssl on;
}
}

Flask deployment server redirects add server name to address

I configured Nginx as a reverse proxy to a Gunicorn server running on 127.0.0.1:8000.
Nginx configuration is like this:
server {
server_name www.programlama.tk;
rewrite ^ http://programlama.tk/ permanent;
}
server {
listen 80; # listen onport 80
server_name programlama.tk localhost; #requests to this domain or ip
location / {
include proxy_params;
proxy_pass http://127.0.0.1:8000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
So far so good. In my flask application when the user authenticates there is a simple method that redirects to the user's home page which is 'ev'. 'Ev' means home.
#app.route('/ev')
def ev():
return render_template('ev.html')
But instead of http://programlama.tk/ev this, it redirects to
http://programlama.tk%2Cprogramlama.tk/ev
this address, which doesn't exist. Also, it adds the server name to the redirect address.

I changed the nginx configuration a bit as described in the documentation.
Now it works as expected.
location / {
proxy_pass http://127.0.0.1:8000/;
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_set_header X-Forwarded-Proto $scheme;
}

Flask Nginx url_for _external

How does one make the server name replace the localhost when using url_for with _external = True (so: url_for('foobar', _external=True)) under Nginx?
I'm running a flask application.
nginx setting
server {
listen 80;
server_name _;
access_log /var/log/nginx/simplemadetutor.access.log;
error_log /var/log/nginx/simplemadetutor.error.log;
location / {
proxy_pass http://127.0.0.1:8000;
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;
}
location /static {
alias /home/implemad/www/simplemadetutor/app/static;
}
location /favicon.ico {
alias /home/implemad/www/simplemadetutor/app/static/img/favicon.ico;
}
}
the problem is if i type url_for('main.index', _external=True) instead of seeing something like http://simplemadetutor.com I see http://127.0.0.1:8000/
I have tried setting SERVER_NAME = 'simplemadetutor.com'; however, this seem to put the simplemadetutor.com in front of every url generated by url_for extead of just the ones with external=True.

Connection Refused while deploying sentry server in Nginx

Am using python sentry server for tracking logs of my website.And i have used nginx server to deploy it, my servers IP is xx.xx.xx.xx when i open this in browser it shows me 502 Bad Gateway and when i checked the log it shows
"connect() failed (111: Connection refused) while connecting to upstream".
Below is configuration i have used in NGINX ,
log_format timed_combined '$remote_addr - $remote_user [$time_local] '
'"$request" $status $body_bytes_sent '
'"$http_referer" "$http_user_agent" '
'$request_time $upstream_response_time $pipe';
server {
listen 80;
server_name xx.xx.xx.xx ;
root /srv/www/name-sentry;
location / {
return 301 https://$host$request_uri;
}
}
server {
listen 443 default ssl;
ssl on;
ssl_certificate /etc/ssl/xx.xx.xx.xx/ssl.crt;
ssl_certificate_key /etc/ssl/xx.xx.xx.xx/ssl.key;
ssl_ciphers '';
ssl_prefer_server_ciphers on;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_session_cache shared:SSL:10m;
add_header Strict-Transport-Security "max-age=2592000; includeSubDomains";
keepalive_timeout 0;
# CHANGE ME: long timeout for ERP POST images
proxy_read_timeout 200;
proxy_send_timeout 200;
server_name xx.xx.xx.xx ;
root /srv/www/name-sentry;
access_log /var/log/nginx/name-sentry-access.log timed_combined;
error_log /var/log/nginx/name-sentry-error.log;
error_page 502 /502.html;
error_page 503 /503.html;
error_page 504 /504.html;
try_files $uri #name-sentry;
location / {
proxy_pass http://xx.xx.xx.xx;
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_set_header Host $http_host;
#proxy_set_header X-Real-IP $remote_addr;
#proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
#proxy_set_header X-Forwarded-Protocol https;
#add_header Access-Control-Allow-Origin "*";
#add_header Access-Control-Allow-Credentials "true";
#add_header Access-Control-Allow-Methods "GET, POST, OPTIONS";
#add_header X-Backend-Server $hostname;
}
}
NOTE: xx.xx.xx.xx--is my IP.Command to start sentry server is "sentry start" and it works and sentry uses 9000 port.What is the solution of this ?