Error map
context deadline exceeded Go: Get "https://api.example.com": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
Go · layer 4, Application & API
Centre: this error. First ring: errors it is linked with (12). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (12)
Go: cannot assign to struct field users["bob"].Age in map
Map values are not addressable, so you cannot modify a field of a struct stored directly in a map.
Go: panic: assignment to entry in nil map
You wrote to a map that was declared but never initialised.
Go: context canceled (rpc error: code = Canceled desc = context canceled)
The context was cancelled before the operation finished — the caller gave up, the client disconnected, or a parent was cancelled.
Go: listen tcp :8080: bind: address already in use
The port your Go server wants is already taken by another process (or a previous instance of your app).
Go: accept tcp [::]:8080: accept4: too many open files / open x: too many open files
The process reached its file-descriptor limit — usually leaked connections, files or response bodies.
Go: net/http: request canceled (Client.Timeout exceeded while awaiting headers)
An `http.Client` with a Timeout gave up waiting for the server's response headers.
Go: panic: test timed out after 10m0s — running tests: TestFoo (10m0s)
`go test` killed the test binary because it exceeded the timeout (default 10 minutes), usually a hung test.
Google API: 429 RESOURCE_EXHAUSTED — Quota exceeded for quota metric 'Read requests' and limit 'Read requests per minute per user'
Your project or user exceeded an API rate or daily quota.
Cloud Functions: Function execution took 60002 ms, finished with status: 'timeout'
The function ran past its timeout (default 60s for HTTP 1st gen) and was terminated.
Laravel: Illuminate\Http\Client\ConnectionException: cURL error 28: Operation timed out after 30001 milliseconds with 0 bytes received
The Laravel `Http::` client waited for a response longer than its timeout and gave up.
Go: dial tcp 127.0.0.1:5432: connect: connection refused
Nothing is listening on the host and port your Go program tried to connect to.
Go: assignment mismatch: 1 variable but os.Open returns 2 values
The number of variables on the left does not match the number of values the function returns.
Two steps away (32)
Go: ./main.go:5:2: "os" imported and not used
The file imports a package that no code in that file uses; Go treats this as a compile error, not a warning.
Go: ./main.go:12:2: undefined: handler
The compiler cannot find an identifier — a typo, a missing import, or it lives in another file/package that wasn't built.
Go: ./main.go:18:1: missing return
A function with a return type can reach its end without a return statement on some path.
Go: panic: runtime error: invalid memory address or nil pointer dereference
The program used a pointer, map, interface or struct field that was nil — usually an uninitialised value or an ignored error.
Go: panic: runtime error: index out of range [3] with length 3
Code accessed a slice, array or string element beyond its length.
Go: panic: runtime error: slice bounds out of range [:5] with capacity 3
A slice expression `s[a:b]` used bounds outside the slice's length or capacity.
Go: panic: send on closed channel
A goroutine sent a value to a channel after it had been closed.
Go: sql: database is closed
The `*sql.DB` handle was closed (or the connection died) before the query ran.
Docker: Bind for 0.0.0.0:80 failed: port is already allocated
Another container or host process already publishes that host port.
Error response from daemon: network X not found
The container or Compose project refers to a Docker network that doesn’t exist (any more).
Error response from daemon: Pool overlaps with other one on this address space
Docker tried to create a network whose subnet clashes with an existing Docker network (or a VPN/host route).
driver failed programming external connectivity on endpoint: iptables: No chain/target/match by that name
Docker’s iptables rules were wiped (firewalld/ufw reload, iptables flush) while Docker was running, so it can’t publish ports.
Go: cannot find package "github.com/pkg/errors" in any of: /usr/local/go/src/github.com/pkg/errors (from $GOROOT) /go/src/github.com/pkg/errors (from $GOPATH)
Go could not locate an imported package — it is not downloaded, the module is not initialised, or GOPATH mode is in effect.
macOS: Error: EMFILE: too many open files, watch / ulimit: setrlimit failed: invalid argument
A process hit the low default per-process open-file limit on macOS (256 soft in shells), common with file watchers and big builds.
Go: http: superfluous response.WriteHeader call from main.handler (main.go:25)
A handler wrote the status header more than once, or wrote the body first (which sends 200) and then tried to set another status.
Go: fatal error: all goroutines are asleep - deadlock!
Every goroutine is blocked waiting (on a channel, mutex or WaitGroup), so the program can never continue.
Go: panic: sync: negative WaitGroup counter
`wg.Done()` was called more times than `wg.Add()`.
GKE/Compute: Quota 'CPUS' exceeded. Limit: 8.0 in region us-central1 (QUOTA_EXCEEDED)
Creating nodes or clusters needs more vCPUs than your project's regional quota allows.
Google Cloud: 403 SERVICE_DISABLED — Cloud Resource Manager API has not been used in project 123456 before or it is disabled. Enable it by visiting
The Google API you called is not enabled for the project that the request is billed to.
gcloud/ADC: WARNING: Your active project does not match the quota project in your local Application Default Credentials file
Application Default Credentials bill API usage to a different project than the one you have set as active, which can cause surpri…
Cloud Run: 504 Gateway Timeout — The request has been terminated because it has reached the maximum request timeout
The request ran longer than the service's request timeout (default 5 minutes, max 60), so Cloud Run closed it.
Pub/Sub: Messages keep being redelivered — acknowledgement deadline expired before the subscriber acked
Your subscriber took longer than the ack deadline to acknowledge, so Pub/Sub redelivered the message (duplicate processing).
Cloud Functions: Provided module can't be loaded / Function failed on loading user code. This is likely due to a bug in the user code
The function started but could not import/initialise your code, so every invocation fails.
Laravel/PHP 8: ErrorException: Attempt to read property "name" on null
You accessed a property on a value that is `null`, typically an empty relationship or a query that found nothing.
Laravel/PHP: Allowed memory size of 134217728 bytes exhausted (tried to allocate 20480 bytes) in vendor/laravel/framework
A request (or artisan job) used more memory than PHP's `memory_limit` allows.
Laravel: Symfony\Component\ErrorHandler\Error\FatalError: Maximum execution time of 30 seconds exceeded
A web request ran longer than PHP's `max_execution_time` and was killed.
Go: invalid character '<' looking for beginning of value
The decoder received something that is not JSON — often an HTML error page, an empty body or plain text.
Go: x509: certificate signed by unknown authority
The Go TLS client does not trust the CA that signed the server's certificate.
Go: x509: certificate is valid for www.example.com, not api.example.com
The server's certificate does not list the hostname you connected to (SAN mismatch), or it has expired.
Go: ./main.go:9:6: no new variables on left side of :=
`:=` declares variables, but all names on the left already exist in the same scope.
Go: invalid operation: a + b (mismatched types int and float64)
You combined two values of different types; Go never converts numeric types implicitly.
Go: cannot use "5" (untyped string constant) as int value in argument to f
A value's type is not assignable to the type required by the variable, parameter or return value.
Map another error
Popular: 500403400ORA-009331064Critical errorFileNotFoundException assemblyTypeError