I created an endpoint on my flask which generates a spreadsheet from a database query (remote db) and then sends it as a download in the browser. Flask doesn’t throw any errors. Uwsgi doesn’t complain.
But when I check nginx’s error.log I see a lot of
2014/12/10 05:06:24 [error] 14084#0: *239436 upstream prematurely
closed connection while reading response header from upstream, client:
34.34.34.34, server: me.com, request: “GET /download/export.csv HTTP/1.1”, upstream: “uwsgi://0.0.0.0:5002”, host: “me.com”, referrer:
“https://me.com/download/export.csv“
I deploy the uwsgi like
uwsgi --socket 0.0.0.0:5002 --buffer-size=32768 --module server --callab app
my nginx config:
server {
listen 80;
merge_slashes off;
server_name me.com www.me.cpm;
location / { try_files $uri @app; }
location @app {
include uwsgi_params;
uwsgi_pass 0.0.0.0:5002;
uwsgi_buffer_size 32k;
uwsgi_buffers 8 32k;
uwsgi_busy_buffers_size 32k;
}
}
server {
listen 443;
merge_slashes off;
server_name me.com www.me.com;
location / { try_files $uri @app; }
location @app {
include uwsgi_params;
uwsgi_pass 0.0.0.0:5002;
uwsgi_buffer_size 32k;
uwsgi_buffers 8 32k;
uwsgi_busy_buffers_size 32k;
}
}
Is this an nginx or uwsgi issue, or both?
Best answer
Change nginx.conf to include
sendfile on;
client_max_body_size 20M;
keepalive_timeout 0;
See self answer uwsgi upstart on amazon linux for full example