ErrLookup › gofiber/fiber

gofiber/fiber

⚡️ Express inspired web framework written in Go · Go · 172 source files

Analyzed at 9a4c7e57fe on 2026-08-04. 257 documented errors.

Code / Message	Type	Severity	Tags
binder: suitable content not found to parse body	exception	error
binder: map destination is nil and cannot be initialized	exception	error
binder: invalid destination value	exception	error
unmatched brackets	validation	error
binder: must explicitly set up CBOR, please check docs: http	exception	error
binder: msgpack is not configured, please check docs: https:	exception	error
failed to append certificate	exception	error
timeout or cancel	exception	error
protocol not supported; only http or https are allowed	validation	error
the file should have a name	validation	error
the body type should be []byte	validation	error
only file paths and io.Writer are supported	validation	error
the body type is not supported	validation	error
client: HTTPS to HTTP redirect blocked	http	error
client cannot be nil	exception	error
datetime constraint requires a layout argument	validation	error
minLen constraint requires an argument	validation	error
maxLen constraint requires an argument	validation	error
len constraint requires an argument	validation	error
betweenLen constraint requires two arguments	validation	error
min constraint requires an argument	validation	error	routing, constraint, config, fiber
max constraint requires an argument	validation	error	routing, constraint, config, fiber
range constraint requires two arguments	validation	error	routing, constraint, config, fiber
regex constraint requires a pattern argument	validation	error	routing, constraint, regex, config, fiber
shutdown: graceful timeout has been reached, exiting	exception	warning	shutdown, server, lifecycle, fiber
shutdown: server is not running	exception	error	shutdown, server, lifecycle, fiber
runtime.Goexit() called in handler or server panic	exception	error	testing, handler, panic, lifecycle, fiber
fiber: no view engine configured	exception	error	views, config, templates, fiber
tls: AutoCertManager cannot be combined with CertFile/CertKe	exception	error	tls, config, security, https, fiber
range: unsatisfiable range	http	warning	http, range, download, client-error, fiber
binder: custom binder not found, please be sure to enter the	exception	error	binding, config, fiber
format: at least one handler is required, but none were set	exception	error	response, content-negotiation, fiber
file: file header is nil	exception	error	upload, multipart, files, fiber
file: failed to read file	exception	error	upload, multipart, files, body-limit, fiber
file: failed to store file	exception	error	upload, storage, files, fiber
value not found	validation	warning	extractors, auth, middleware, fiber
cyclic extractor chain	exception	error	extractors, chain, recursion, fiber
logtemplate: unknown tag	exception	error	logging, template, config, fiber
log: context tag name and function are required	validation	error	logging, context, config, validation, fiber
log: context tag is reserved	validation	error	logging, context, config, reserved, fiber
remote address cannot be empty	validation	error	adaptor, network, configuration, net-http
decode SHA256 password: invalid length	validation	critical	basicauth, authentication, configuration, crypto, startup
cache: insufficient space and no entries to evict	exception	error	cache, configuration, memory, middleware
csrf: token not found	validation	error	csrf, security, authentication, middleware, web
csrf: sec-fetch-site header invalid	validation	warning	csrf, security, headers, browser
csrf: referer header missing	validation	warning	csrf, security, headers, https
csrf: referer header invalid	validation	warning	csrf, security, headers, url-parsing
csrf: referer does not match host or trusted origins	validation	warning	csrf, security, headers, cors, configuration
csrf: origin header invalid	validation	warning	csrf, security, headers, url-parsing
csrf: origin does not match host or trusted origins	validation	warning	csrf, security, cors, configuration, origin
encryption key must be 16, 24, or 32 bytes	validation	critical	encryptcookie, crypto, configuration, aes, cookies
hostauthorization: forbidden host	http	warning	hostauthorization, security, configuration, headers
invalid idempotency key	validation	error	idempotency, configuration, headers, api
missing or invalid API Key	validation	error	keyauth, authentication, security, api, headers
logger: unknown template tag	exception	error	logger, configuration, formatting, startup
logger: tag name and function are required	validation	error	logger, configuration, validation, tags
paginate: failed to encode cursor values	exception	error	paginate, serialization, cursor, json
proxy: nil client override passed to Do/Forward	http	error	proxy, configuration, nil-check, client
proxy: upstream scheme is not allowed	http	critical	proxy, security, ssrf, configuration, scheme
proxy: upstream host is empty or invalid	http	critical	proxy, configuration, ssrf, validation, url
proxy: upstream host resolves to a blocked address	exception	error	proxy, ssrf, security, dns, network
proxy: HTTPS to HTTP redirect blocked	exception	warning	proxy, redirect, security, tls, https
failed to type-assert to *Middleware	exception	critical	session, panic, internal, type-assertion
session ID cannot be empty	validation	error	session, validation, storage
session ID not found in session store	exception	warning	session, storage, not-found, expiry
field must not contain CR or LF	validation	warning	sse, validation, injection, security, response-splitting
sse: stream closed	exception	info	sse, stream, lifecycle, disconnect
invalid path	validation	warning	static, path-traversal, security, validation
fiber: shared storage is not configured	exception	error	shared-state, storage, config
fiber: failed to reload views: %w	exception	error	views, template, reload, filesystem
failed to dump request: %w	exception	error	testing, http, request, test-helper
failed to write: %w	exception	error	testing, http, connection, test-helper
failed to read response: %w	exception	error	testing, http, response, test-helper
failed to discard interim response body: %w	exception	error	testing, http, interim-response, test-helper
failed to close interim response body: %w	exception	error	testing, http, interim-response, test-helper
multiple binding_source tags found on struct %s	exception	error	binding, struct-tag, validation, reflection
unknown binding_source %q	exception	error	binding, struct-tag, validation, reflection
unsupported value type: %T	exception	error	binding, binder, internal, type-mismatch, reflection
failed to unmarshal xml: %w	exception	error	binder, xml, unmarshal, body-parser
client: invalid proxy URL: %w	exception	error	client, proxy, config, network
client panic: %v	exception	critical	client, panic, recovery, concurrency
rand.Read failed: %w	exception	critical	client, crypto-rand, multipart, environment
boundary generation: %w	exception	critical	client, multipart, boundary, crypto-rand
set boundary error: %w	exception	error	client, multipart, boundary, validation
failed to close multipart writer: %w	exception	error	client, multipart, body-writer, upload
write formdata error: %w	exception	error	client, multipart, formdata, upload
open file error: %w	exception	error	client, upload, filesystem, permissions
create file error: %w	exception	error	client, multipart, upload, header
failed to copy file data: %w	exception	error	client, upload, io-copy, filesystem
failed to check directory: %w	exception	error	client, save, filesystem, permissions
failed to create directory: %w	exception	error	client, save, filesystem, mkdir, permissions
failed to create file: %w	exception	error	client, save, filesystem, os-create, permissions
failed to write response body to file: %w	exception	error	client, save, io-copy, disk-full, response
failed to write response body to writer: %w	exception	error	client, save, io-writer, streaming, response
parse constraint arg: %w	exception	error	routing, constraint, minlen, registration
file: failed to open file: %q: %w	exception	error	upload, multipart, storage, filesystem, go
file: failed to read file: %q: %w	exception	error	upload, multipart, body-limit, storage, go
file: failed to store file: %q to %q: %w	exception	error	upload, storage, backend, network, go
failed to open: %w	exception	error	filesystem, template, render, go
failed to read: %w	exception	error	filesystem, template, io, render, go
failed to convert: %w	exception	warning	parsing, conversion, validation, go
memory storage %s: %w	exception	warning	storage, context, cancellation, go
tls: cannot load TLS key pair from certFile=%q and keyFile=%	exception	critical	tls, ssl, certificate, startup, security, go
failed to listen: %w	exception	critical	network, listen, port, startup, go
failed to read client CA file %q: %w	exception	critical	mtls, tls, certificate, startup, security, go
failed to parse client CA certificate from %q	exception	critical	tls, mtls, certificates, pem, startup, config
unexpected error when trying to remove unix socket file %q:	exception	error	unix-socket, filesystem, permissions, startup, network
cannot chmod %#o for %q: %w	exception	error	unix-socket, filesystem, permissions, startup, hardening
failed to resolve TCP address after adding port: %w	exception	warning	adaptor, http, network, remote-addr, proxy
failed to resolve TCP address: %w	exception	warning	adaptor, http, network, remote-addr, ipv6
decode SHA512 password: %w	panic	error	basicauth, authentication, passwords, sha512, base64, config
decode SHA256 password: %w	panic	error	basicauth, authentication, passwords, sha256, base64, config
cache: failed to reload key %q after eviction failure: %w	http	error	cache, storage, eviction, redis, bookkeeping
cache: failed to restore heap index for key %q: %w	http	error	cache, storage, eviction, write-failure, bookkeeping
cache: failed to delete expired key %q: %w	http	warning	cache, storage, expiration, delete, redis
cache: failed to delete private response for key %q: %w	http	warning	cache, storage, private, delete, cache-control
cache: failed to delete cached response for key %q: %w	http	warning	cache, storage, private, no-cache, delete, cache-control
cache: failed to delete stale vary manifest %q: %w	http	warning	cache, storage, vary, manifest, delete
cache: failed to delete key %q while evicting: %w	http	error	cache, storage, eviction, delete, errors-join, bookkeeping
cache: failed to delete raw key %q after store error: %w	http	error	cache, storage, cleanup, raw-key, errors-join, write-failure
cache: failed to get key %q from storage: %w	http	error	cache, storage, network, redis, fiber
cache: failed to unmarshal key %q: %w	http	error	cache, serialization, msgpack, version-drift, fiber
cache: unexpected entry type %T for key %q	http	warning	cache, memory, type-safety, fiber
cache: failed to get raw key %q from storage: %w	http	error	cache, storage, network, redis, fiber
cache: unexpected raw entry type %T for key %q	http	warning	cache, memory, type-safety, fiber
cache: failed to marshal key %q: %w	http	error	cache, serialization, msgpack, fiber
cache: failed to store key %q: %w	http	error	cache, storage, network, redis, fiber
cache: failed to store raw key %q: %w	http	error	cache, storage, network, redis, fiber
cache: failed to delete key %q: %w	http	warning	cache, storage, network, fiber
cache: no cached body for key %q: %w	http	info	cache, miss, fiber
csrf: failed to fetch token from storage: %w	http	error	csrf, storage, network, security, fiber
csrf: failed to store token in storage: %w	http	error	csrf, storage, network, security, fiber
csrf: failed to delete token from storage: %w	http	warning	csrf, storage, network, security, fiber
csrf: failed to get value from storage: %w	http	error	csrf, storage, network, security, fiber
csrf: unexpected value type %T in storage	http	warning	csrf, memory, type-safety, fiber
csrf: failed to store key %q: %w	http	error	csrf, storage, network, security, fiber
csrf: failed to delete key %q: %w	http	warning	csrf, storage, network, security, fiber
failed to base64-decode key: %w	http	critical	encryptcookie, config, base64, crypto, fiber
failed to create AES cipher: %w	http	critical	encryptcookie, crypto, aes, fiber
failed to create GCM mode: %w	http	critical	encryptcookie, crypto, aes, gcm, fiber
failed to base64-decode value: %w	http	warning	crypto, cookie, base64, encryptcookie
failed to decrypt ciphertext: %w	http	warning	crypto, gcm, cookie, encryptcookie, authentication
favicon: read limited: %w	panic	critical	favicon, filesystem, startup, panic
favicon: file size exceeds max bytes %d	panic	critical	favicon, config, startup, panic, filesize
`ErrInvalidIdempotencyKey` %w: invalid length: %d != %d	validation	warning	idempotency, validation, uuid, header
failed to read response: %w	http	error	idempotency, storage, network, redis
failed to unmarshal response: %w	http	error	idempotency, msgpack, serialization, storage
failed to write cached response at fastpath: %w	http	error	idempotency, storage, fastpath, wrapper
failed to lock: %w	http	error	idempotency, lock, distributed, redis
failed to write cached response while locked: %w	http	error	idempotency, storage, lock, wrapper
failed to bind to response headers: %w	http	error	idempotency, binding, fiber, unreachable
failed to marshal response: %w	http	error	idempotency, msgpack, codegen, unreachable
failed to save response: %w	http	error	idempotency, storage, write, redis
limiter: failed to persist state: %w	http	error	limiter, fixed-window, storage, write
limiter: failed to persist state: %w	http	error	limiter, sliding-window, storage, write
limiter: failed to get key %q from storage: %w	http	error	limiter, storage, read, redis, manager
limiter: failed to unmarshal key %q: %w	http	error	limiter, storage, msgp, serialization, deserialization, version-mismatch
limiter: unexpected entry type %T for key %q	http	error	limiter, memory, type-assertion, invariant
limiter: failed to marshal key %q: %w	http	error	limiter, storage, msgp, serialization, codegen
limiter: failed to store key %q: %w	http	error	limiter, storage, redis, persistence, network
`ErrCursorEncode` %w: %w	http	error	paginate, cursor, json, serialization
proxy: parse upstream %q: %w	http	error	proxy, url-parsing, configuration, input-validation
`ErrUpstreamSchemeNotAllowed` %w: %q	http	error	proxy, ssrf, scheme, security, allowlist
`ErrUpstreamHostBlocked` %w: %s	http	error	proxy, balancer, ssrf, private-ip, security, configuration
proxy: invalid dial address %q: %w	http	error	proxy, dialer, ssrf, address-parsing
%v	exception	error	recover, panic, middleware, error-handling
failed to encode data: %w	http	error	session, gob, serialization, encoding, configuration
failed to decode session data: %w	http	error	session, gob, serialization, fiber
failed to encode session data: %w	http	error	session, gob, serialization, fiber
failed to decode session data: %w	http	error	session, gob, serialization, store, fiber
failed to reset session: %w	http	error	session, storage, timeout, fiber
sse: invalid id: %w	exception	warning	sse, validation, fiber
sse: invalid event: %w	exception	warning	sse, validation, fiber
sse: write event: %w	exception	info	sse, network, disconnect, fiber
sse: write heartbeat: %w	exception	info	sse, network, heartbeat, fiber
sse: write comment: %w	exception	info	sse, network, fiber
sse: finish comment: %w	exception	info	sse, network, fiber
sse: marshal data: %w	exception	error	sse, json, serialization, fiber
sse: handler panic: %v	exception	error	sse, panic, recovery, fiber
sse: write retry: %w	exception	info	sse, network, fiber
prefork: %w	exception	critical	prefork, network, startup, reuseport, fiber
format handler is nil for media type %q at index %d	exception	error	content-negotiation, validation, fiber
failed to render: %w	exception	error	template, render, fiber
failed to parse: %w	exception	error	template, parse, fiber
failed to execute: %w	exception	error	template, execute, fiber
failed to determine abs file path: %w	exception	error	filesystem, sendfile, fiber
failed to write string: %w	exception	error	routing, buffer, url-building, io
fiber: service at index %d is nil	exception	critical	services, config, startup, nil-check
context canceled while starting service %s: %w	exception	error	services, context, startup, cancellation, deadline
service %s start: %w	exception	error	services, context, startup, deadline, cancellation
fiber: service %q is nil	exception	critical	services, shutdown, state, nil-check, invariant
service %s terminate: %w	exception	warning	services, shutdown, context, cancellation, deadline
fiber: failed to encode shared state %s value: %w	exception	error	shared-state, serialization, encode, json, xml, msgpack, cbor
fiber: failed to decode shared state %s value: %w	exception	error	shared-state, deserialization, decode, json, xml, msgpack, cbor, schema
fiber: shared state %s %s is not configured	exception	error	shared-state, config, codecs, msgpack, cbor, misconfiguration
fiber: failed to %s shared state %s value: %w	exception	error	shared-state, codecs, panic, recover, binder
fiber: failed to %s shared state %s value: %v	exception	error	shared-state, codecs, panic, recover, custom-codec
%s: invalid handler #%d (%T)\n	panic	critical	routing, handlers, adapter, panic, type-mismatch
use: invalid handler %v\n	panic	critical	middleware, use, handlers, panic, type-mismatch
route handler 'fn' cannot be nil	panic	critical	routing, route-group, nil-check, panic, config
fasthttp.Client must not be nil	panic	critical	client, fasthttp, nil-check, panic, http-client
fasthttp.HostClient must not be nil	panic	error	client, nil-check, constructor, fasthttp
fasthttp.LBClient must not be nil	panic	error	client, nil-check, constructor, load-balancing, fasthttp
fiber: Config.RegexHandler return type must support MatchStr	panic	error	routing, config, regex, constraint, panic
fiber: Config.RegexHandler must not return nil	panic	error	routing, config, regex, constraint, nil-check, panic
fiber: Config.RegexHandler must be a non-nil function	panic	error	routing, config, regex, constraint, panic, reflection
fiber: Config.RegexHandler must have signature func(string)	panic	error	routing, config, regex, constraint, signature, panic
Domain pattern cannot be empty	panic	error	routing, domain, validation, panic, host-routing
Domain pattern '%s' exceeds RFC 1035 maximum of 253 characte	panic	error	routing, domain, validation, rfc-1035, panic
Domain pattern '%s' has %d parts, which exceeds the maximum	panic	error	routing, domain, validation, dos-protection, panic
Domain pattern '%s' contains empty label at position %d	panic	error	routing, domain, validation, rfc-1035, panic
Domain pattern '%s' contains empty parameter name at positio	panic	error	routing, domain, validation, parameter, panic
Domain pattern '%s' contains invalid parameter name '%s' wit	panic	error	routing, domain, validation, parameter, ascii, panic
Domain pattern '%s' has label '%s' exceeding RFC 1035 limit	panic	error	routing, domain, validation, rfc-1035, panic
Domain pattern '%s' contains invalid character '%c' in label	panic	error	routing, domain, validation, rfc-1035, ascii, panic
Domain pattern '%s' has %d parameters, which exceeds the max	panic	error	routing, domain, validation, parameter, limits, panic
use: invalid handler %v	panic	error	routing, domain, middleware, handler, panic
Request Entity Too Large	http	warning	adaptor, net-http, body-limit, http-413, middleware
Internal Server Error	http	error	adaptor, net-http, body-stream, http-500, io-error, middleware
basicauth: charset must be UTF-8	panic	critical	basicauth, authentication, config, charset, rfc-7617, panic
[CORS] Invalid origin format in configuration: ${maskedOrigi	panic	critical	cors, security, config, origin, wildcard, panic
[CORS] Invalid origin format after normalization:${maskedOri	panic	critical	cors, security, origin, internal, panic, defensive
[CORS] Configuration error: When 'AllowCredentials' is set t	panic	critical	cors, security, credentials, wildcard, spec-compliance, panic
CSRF: Extractor reads from the same cookie '${CookieName}' u	panic	critical	csrf, security, cookie, extractor, misconfiguration, panic
CSRF: Chained extractor reads from the same cookie '${Cookie	panic	critical	csrf, security, extractor, chain, cookie, panic
[CSRF] Invalid origin format in configuration:${maskedOrigin	panic	critical	csrf, security, origin, trusted-origins, wildcard, panic
fiber: encrypt cookie middleware requires key	panic	critical	encryptcookie, security, config, key, cookies, panic
helmet: HSTSMaxAge must be greater than or equal to 0	panic	critical	helmet, hsts, security, config, headers, panic
helmet: HSTSPreloadEnabled requires HSTSExcludeSubdomains to	panic	critical	helmet, hsts, preload, security, config, panic
hostauthorization: AllowedHosts or AllowedHostsFunc is requi	panic	critical	hostauthorization, security, config, allowed-hosts, panic
hostauthorization: invalid host ${host} — subdomain wildcard	panic	critical	hostauthorization, security, wildcard, config, dns, panic
hostauthorization: host %q exceeds RFC 1035 maximum of %d ch	panic	critical	hostauthorization, security, rfc-1035, dns, config, panic
hostauthorization: host %q has label %q exceeding RFC 1035 l	panic	critical	hostauthorization, security, rfc-1035, dns, label-length, panic
fiber: keyauth middleware requires a validator function	panic	critical	keyauth, authentication, config, validator, panic
fiber: keyauth unsupported error token	panic	error	keyauth, config, auth, rfc6750, panic
fiber: keyauth error_description requires error	panic	error	keyauth, config, auth, rfc6750, panic
fiber: keyauth error_uri requires error	panic	error	keyauth, config, auth, rfc6750, panic
fiber: keyauth error_uri must be absolute	panic	error	keyauth, config, auth, rfc6750, url, panic
fiber: keyauth insufficient_scope requires scope	panic	error	keyauth, config, auth, rfc6750, scope, panic
fiber: keyauth scope contains invalid token	panic	error	keyauth, config, auth, rfc6750, scope, validation, panic
fiber: keyauth scope requires insufficient_scope error	panic	error	keyauth, config, auth, rfc6750, scope, panic
logger: RegisterContextTag requires a non-empty name and ext	panic	error	logger, config, registration, panic
Servers cannot be empty	panic	error	proxy, config, panic
proxy: WithClient requires a non-nil *fasthttp.Client	panic	error	proxy, config, ssrf, nil-check, panic
Servers cannot be empty	panic	error	proxy, config, load-balancer, panic
[session] AbsoluteTimeout must be greater than or equal to I	panic	error	session, config, timeout, panic
sse: Handler must not be nil	panic	error	sse, config, handler, panic
route handler 'fn' cannot be nil	panic	error	routing, domain, handler, panic
use: invalid handler %v	panic	error	routing, group, middleware, type-error, panic
route handler 'fn' cannot be nil	panic	error	routing, group, handler, panic
unsupported TLS version, please use tls.VersionTLS12 or tls.	panic	error	tls, listen, security, config, panic
Route '%s' has %d parameters, which exceeds the maximum of %	panic	error	routing, path, parameters, limit, panic
missing handler/middleware in route: %s	panic	error	routing, handler, registration, panic
nil handler in route: %s	panic	error	routing, handler, nil-check, panic
add: invalid http method %s	panic	critical	router, http-method, startup, panic, registration
state: dependency not found!	panic	critical	state, dependency-injection, panic, key-not-found
state: service not found!	panic	critical	services, state, dependency-injection, panic, lifecycle