Golang - Nginx proxy pass issue

I have a golang application running on port 3001. curl http://127.0.0.1:3001 gives the correct HTML response. But I am facing issues when I am trying to do a proxy_pass via NginX.

Below is my NginX configuration. I am doing a route based location block -

upstream my-app { server 127.0.0.1:3001; } server { listen 80 default_server; server_name localhost; underscores_in_headers on; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; error_page 404 /404.html; client_max_body_size 300M; location ^~ /theapp { proxy_redirect off; 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-Proto $scheme; proxy_pass http://my-app; } } 

When I access http://example.com/theapp/, it downloads the my-app binary instead of forwarding the http request to my-app.

What am I doing wrong?

Output of nginx -T -

nginx: the configuration file /mnt/vol1/nginx/conf/nginx.conf syntax is ok nginx: configuration file /mnt/vol1/nginx/conf/nginx.conf test is successful # configuration file /mnt/vol1/nginx/conf/nginx.conf: #user nobody; worker_processes 12; access_log /mnt/vol2/logs/nginx/access.log main-2 buffer=5k; error_log /mnt/vol2/logs/nginx/error.log; events { worker_connections 4000; multi_accept on; } http { include mime.types; underscores_in_headers on; default_type application/octet-stream; log_format main-2 '$host $http_client_ip $remote_addr - $remote_user - $request_time [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for" ' '"$http_cache_control" ' '"$http_via" '; client_body_timeout 10; client_header_timeout 10; keepalive_timeout 5; send_timeout 10; sendfile on; upstream my-app { server 127.0.0.1:3001; } server { listen 80 default_server; server_name localhost; underscores_in_headers on; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; error_page 404 /404.html; client_max_body_size 300M; location ^~ /theapp { proxy_redirect off; 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-Proto $scheme; proxy_pass http://my-app; } } } # configuration file /mnt/vol1/nginx/conf/mime.types: types { text/html html htm shtml; text/css css; text/xml xml; image/gif gif; image/jpeg jpeg jpg; application/javascript js; application/atom+xml atom; application/rss+xml rss; text/mathml mml; text/plain txt; text/vnd.sun.j2me.app-descriptor jad; text/vnd.wap.wml wml; text/x-component htc; image/png png; image/tiff tif tiff; image/vnd.wap.wbmp wbmp; image/x-icon ico; image/x-jng jng; image/x-ms-bmp bmp; image/svg+xml svg svgz; image/webp webp; application/font-woff woff; application/java-archive jar war ear; application/json json; application/mac-binhex40 hqx; application/msword doc; application/pdf pdf; application/postscript ps eps ai; application/rtf rtf; application/vnd.apple.mpegurl m3u8; application/vnd.ms-excel xls; application/vnd.ms-fontobject eot; application/vnd.ms-powerpoint ppt; application/vnd.wap.wmlc wmlc; application/vnd.google-earth.kml+xml kml; application/vnd.google-earth.kmz kmz; application/x-7z-compressed 7z; application/x-cocoa cco; application/x-java-archive-diff jardiff; application/x-java-jnlp-file jnlp; application/x-makeself run; application/x-perl pl pm; application/x-pilot prc pdb; application/x-rar-compressed rar; application/x-redhat-package-manager rpm; application/x-sea sea; application/x-shockwave-flash swf; application/x-stuffit sit; application/x-tcl tcl tk; application/x-x509-ca-cert der pem crt; application/x-xpinstall xpi; application/xhtml+xml xhtml; application/xspf+xml xspf; application/zip zip; application/octet-stream bin exe dll; application/octet-stream deb; application/octet-stream dmg; application/octet-stream iso img; application/octet-stream msi msp msm; application/vnd.openxmlformats-officedocument.wordprocessingml.document docx; application/vnd.openxmlformats-officedocument.spreadsheetml.sheet xlsx; application/vnd.openxmlformats-officedocument.presentationml.presentation pptx; audio/midi mid midi kar; audio/mpeg mp3; audio/ogg ogg; audio/x-m4a m4a; audio/x-realaudio ra; video/3gpp 3gpp 3gp; video/mp2t ts; video/mp4 mp4; video/mpeg mpeg mpg; video/quicktime mov; video/webm webm; video/x-flv flv; video/x-m4v m4v; video/x-mng mng; video/x-ms-asf asx asf; video/x-ms-wmv wmv; video/x-msvideo avi; }