Go "Context Deadline Exceeded" Error Handling in HTTP Requests
"Context deadline exceeded" means an operation using a Go context.Context ran longer than its configured deadline allowed — handling it well means both setting...
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Go Interface Conversion Panic (interface is X, Not Y)
An interface conversion panic means a type assertion assumed an interface value held a specific concrete type, but at runtime it actually held a different one...
Go Goroutine Leak, How to Detect and Fix
A goroutine leak happens when a goroutine gets stuck permanently — usually blocked waiting on a channel operation that will never complete — and never...
Go "Nil Pointer Dereference" Panic, How to Debug
A nil pointer dereference panic means your code tried to access a field or method on a pointer that was never actually assigned a valid value — Go's type...
Go "Undefined: Package" After Adding New File
When Go reports something as "undefined" right after you add a new file to an existing package, the new file's contents almost always aren't actually part of...
Go GORM Foreign Key Constraint Violation on Insert
A foreign key constraint violation in GORM during an insert almost always means you're trying to save a record that references a parent row which doesn't exist...
Go "Package Not Found" After go mod tidy
Running go mod tidy is supposed to clean up your dependencies, but it can sometimes leave you with a "package not found" error for something that was working...
Go Struct JSON Tags Not Serializing Correctly
When a Go struct doesn't serialize to JSON the way you expect — fields missing entirely, wrong key names, or values that should be omitted but aren't — the...
How to Fix Nginx 502 Bad Gateway on AWS ALB / CloudFront Upstream Connection
Nginx returns 502 errors specifically when deployed behind AWS Application Load Balancer or CloudFront, even though the same Nginx configuration works fine...