ErrLookup › gofiber/fiber

gofiber/fiber

⚡️ Express inspired web framework written in Go · Go · 177 source files

Analyzed at a105acad6c on 2026-08-11. 256 documented errors.

Code / Message	Type	Severity	Tags
`ErrUpstreamHostBlocked` proxy: upstream host resolves to a blocked address	panic	critical	proxy, ssrf, security, config, startup, panic
betweenLen constraint requires two arguments	validation	error	routing, constraint, route-registration, validation
Request Entity Too Large	http	warning	adaptor, body-limit, http, config, middleware
`ErrUnknownTag` logger: unknown template tag	panic	error	logger, template, tag-registry, config, startup-panic
`ErrUpstreamHostInvalid` proxy: upstream host is empty or invalid	panic	critical	proxy, config, startup, panic, ssrf
parse constraint arg	validation	error	routing, validation, configuration, gofiber, constraints
min constraint requires an argument	validation	error	routing, constraint, route-registration, validation
[CORS] Invalid origin format in configuration:	panic	error	middleware, cors, config, validation, security, startup
regex constraint requires a pattern argument	validation	error	routing, constraint, route-registration, regex, validation
[session] AbsoluteTimeout must be greater than or equal to…	panic	error	session, config, panic, middleware
fiber: failed to shared state value	panic	error	shared-state, codec, serialization, panic-recovery
Domain pattern ' ' contains invalid parameter name ' ' with…	panic	error	routing, domain, validation, startup
proxy: WithClient requires a non-nil *fasthttp.Client	panic	error	proxy, config, panic, nil-safety
unsupported TLS version, please use tls.VersionTLS12 or…	panic	critical	tls, security, listen, startup, deprecation
[CORS] Invalid origin format after normalization:	panic	error	middleware, cors, config, defensive, unreachable, startup
CSRF: Extractor reads from the same cookie	panic	critical	middleware, csrf, security, extractor, startup
`ErrUpstreamSchemeNotAllowed` proxy: upstream scheme is not allowed	panic	error	proxy, ssrf, security, scheme, config, startup-panic
max constraint requires an argument	validation	error	routing, constraint, route-registration, validation
state: service not found!	panic	error	state, panic, runtime, services
decode SHA512 password	validation	error	basicauth, authentication, password-hash, base64, config
tls: cannot load TLS key pair from certFile=	exception	critical	tls, startup, configuration, security, gofiber, certificates
range constraint requires two arguments	validation	error	routing, constraint, route-registration, validation
shutdown: graceful timeout has been reached, exiting	exception	error	shutdown, lifecycle, sentinel, network
hostauthorization: invalid host	panic	error	hostauthorization, config, wildcard, dns, startup-panic
%w: %w	exception	error	client, redirect, url-parsing, transport, security
proxy: upstream scheme is not allowed	error_code	error	proxy, security, ssrf, url-validation, scheme
runtime.Goexit() called in handler or server panic	exception	critical	testing, handler, panic, lifecycle, app-test
cache: insufficient space and no entries to evict	error_code	warning	cache, config, eviction
csrf: referer header invalid	http	warning	csrf, security, headers, referer
Route ' ' has parameters, which exceeds the maximum of	panic	error	router, config, panic, routing
cache: failed to delete raw key	http	warning	cache, storage, cleanup, cascading, best-effort, go, fiber
hostauthorization: forbidden host	http	error	hostauthorization, security, config, headers
datetime constraint requires a layout argument	validation	error	routing, constraints, datetime, fiber
range: unsatisfiable range	http	warning	range, http, sentinel, streaming
csrf: origin header invalid	http	warning	csrf, security, headers, origin
decode SHA256 password: invalid length	validation	error	basicauth, auth, config, crypto
add: invalid http method	panic	error	router, config, panic, routing, http
: has no usable address	validation	error	proxy, ipv6, dialer, dual-stack, network
[CORS] Configuration error: When 'AllowCredentials' is set…	panic	critical	middleware, cors, security, credentials, cors-misconfiguration, startup
%v	panic	error	recover, panic, middleware, error-handling
cache: failed to delete cached response for key	http	warning	cache, storage, delete, vary, no-cache, rfc-9111
fiber: keyauth scope contains invalid token	panic	error	keyauth, oauth, scope, rfc-6750, header-injection, config, auth, startup-panic
router: route path cannot be expressed as a relative URL	validation	error	routing, url, redirect, mount, validation
client: HTTPS to HTTP redirect blocked	http	warning	client, redirect, tls, security, http
test: got empty response	exception	error	testing, http, fiber, test-harness
use: invalid handler	panic	error	routing, group, handler, type-mismatch, startup
log: context tag is reserved	validation	warning	log, config, template
cache: failed to delete expired key	http	warning	cache, storage, expiration, delete, request-path
CSRF: Chained extractor reads from the same cookie	panic	critical	middleware, csrf, security, extractor, chained, startup
binder: map is not convertible to map[string]string or…	validation	error	binding, reflection, map, fiber
failed to create GCM mode	validation	error	crypto, aes-gcm, encryptcookie, stdlib
missing handler/middleware in route	panic	error	router, config, panic, routing
proxy: nil client override passed to Do/Forward	error_code	error	proxy, config, nil-check
state: dependency not found!	panic	error	state, panic, runtime, config
failed to encode data	exception	error	session, serialization, gob, encoding
%w: %q: %w	exception	error	upload, multipart, storage, gofiber, filesystem
helmet: HSTSMaxAge must be greater than or equal to 0	panic	error	helmet, hsts, config, security-header, startup-panic
failed to parse client CA certificate from	exception	critical	tls, mtls, x509, pem, startup, listen
use: invalid handler	panic	error	routing, domain, handler, type-mismatch, startup
%w: %s	validation	critical	proxy, ssrf, balancer, security-policy, private-ip
cache: failed to delete key	http	error	cache, storage, eviction, compound-error, redis, distributed
Servers cannot be empty	panic	error	proxy, balancer, config, required-field, startup-panic
failed to create AES cipher	validation	error	encryptcookie, crypto, aes, invariant, go, fiber
cache: failed to reload key	http	warning	cache, storage, eviction, redis, distributed
fiber: keyauth middleware requires a validator function	panic	error	keyauth, config, required-field, auth, startup-panic
csrf: token not found	http	warning	csrf, security, auth
failed to append certificate	exception	critical	tls, certificates, client, pem, panic
fiber: keyauth unsupported error token	panic	error	keyauth, oauth, rfc-6750, config, auth, startup-panic
fiber: Config.RegexHandler return type must support…	panic	critical	config, regex, constraints, reflection, startup
cache: failed to delete private response for key	http	warning	cache, storage, private, delete, vary, security
failed to convert	exception	warning	parsing, validation, helpers, gofiber, generics
file: failed to read file	error_code	error	file, upload, body-limit, io, config
sse: Handler must not be nil	panic	error	sse, config, panic, middleware
csrf: sec-fetch-site header invalid	http	warning	csrf, security, headers
format handler is nil for media type	validation	error	res, format, validation, programming-error, content-negotiation
Domain pattern ' ' contains invalid character '%c' in label	panic	error	routing, domain, dns, validation, startup
remote address cannot be empty	validation	error	adaptor, network, request-conversion
cannot chmod %#o for	exception	error	unix-socket, filesystem, permissions, startup, listen
failed to save response	exception	error	idempotency, storage, redis, write-failure
fiber: shared state is not configured	validation	error	shared-state, codec, config, msgpack, cbor, configuration
binder: must explicitly set up CBOR, please check docs…	validation	error	cbor, binding, configuration, fiber
multiple binding_source tags found on struct	validation	error	bind, struct-tags, reflection, config
sse: marshal data	exception	error	sse, json, serialization, marshaling
value not found	error_code	info	extractors, auth, binding, sentinel, expected
basicauth: charset must be UTF-8	panic	error	middleware, basicauth, config, validation, startup
failed to write string	exception	warning	routing, url-generation, bytebufferpool, defensive
fiber: no view engine configured	validation	error	views, rendering, lifecycle, config
unexpected error when trying to remove unix socket file	exception	error	unix-socket, filesystem, permissions, startup, listen
cache: failed to delete stale vary manifest	http	warning	cache, storage, delete, vary, manifest
failed to resolve TCP address after adding port	exception	warning	adaptor, network, dns, reverse-proxy, net-http
file: failed to open file	error_code	error	file, upload, multipart, storage, io
proxy: invalid dial address	exception	error	proxy, balancer, dialer, host-port, config
failed to listen	exception	critical	network, startup, configuration, socket, gofiber
failed to marshal response	exception	error	idempotency, msgpack, serialization, codegen
protocol not supported; only http or https are allowed	validation	error	client, url, scheme, http
cyclic extractor chain	error_code	error	extractors, chain, recursion, cycle, logic
favicon: read limited	exception	critical	favicon, io, startup-panic, filesystem
limiter: failed to get key	exception	error	limiter, storage, redis, rate-limiting, dependency
paginate: failed to encode cursor values	error_code	error	paginate, cursor, serialization
invalid idempotency key	validation	warning	idempotency, config, headers