Nginx SSL Handshake Failed Error on Specific Mobile Devices or Old Clients
SSL handshake failures affecting only certain devices — often older phones, older browsers, or specific client libraries — while working fine for most...
Category
Nginx
Fixes for reverse proxy errors, SSL configuration, and caching issues in Nginx.
Nginx Subfolder Reverse Proxy Returning 404 for Relative Static Assets
When an application works fine at the domain root but returns 404s for its own static assets once reverse-proxied under a subfolder, the application itself is...
Nginx "Upstream Sent Too Big Header While Reading Response Header From Upstream"
This error means the response headers sent by your backend exceed the buffer size Nginx has allocated to hold them — Nginx's default buffer sizes are...
Nginx 504 Gateway Timeout on Long-Running API Request
A 504 Gateway Timeout on a request that's legitimately slow (a large report generation, a heavy computation, a batch operation) means Nginx gave up waiting for...
Nginx CORS Header "Multiple Values" Received Error
The browser error about receiving multiple values for a CORS header means both Nginx and your backend application are independently setting the same...
Nginx HTTP to HTTPS Redirect Loop Behind Load Balancer
An HTTP-to-HTTPS redirect loop behind a load balancer happens because the load balancer terminates SSL and forwards plain HTTP to Nginx internally — Nginx,...
Nginx proxy_pass Stripping URL Path Prefix Unexpectedly
Whether proxy_pass strips the matched location prefix from the URL before forwarding to the upstream depends on a small, easy-to-miss detail in how the...
Nginx WebSockets Connection Failing With 400 Bad Request
A WebSocket connection failing with 400 Bad Request through Nginx almost always means Nginx isn't forwarding the specific headers required for the...
Nginx client_max_body_size, Fixing "413 Request Entity Too Large"
A 413 error means Nginx itself rejected the request before it ever reached your application, because the request body exceeded the configured...