ErrLookup › valyala/fasthttp

valyala/fasthttp

Fast HTTP package for Go. Tuned for high performance. Zero memory allocations in hot paths. Up to 10x faster than net/http · Go · 74 source files

Analyzed at c96f600972 on 2026-08-31. 176 documented errors.

Code / Message	Type	Severity	Tags
fasthttp: no args value for the given key	exception	warning	query-params, input-validation, fasthttp
brotli: excessive input	exception	error	brotli, compression, data-corruption
empty ip address string	validation	error	ip-parsing, input-validation, empty-input
empty integer	validation	error	integer-parsing, empty-input, input-validation
ip part cannot exceed 255	validation	error	ip-parsing, input-validation, range-error
unexpected first char found: expecting 0-9	validation	error	integer-parsing, input-validation, whitespace
unexpected trailing char found: expecting 0-9	validation	error	integer-parsing, input-validation, trailing-characters
too long int	validation	error	integer-parsing, overflow, input-validation
negative input is invalid	validation	error	float-parsing, input-validation, negative-value
empty hex number	validation	error	chunked-encoding, http-protocol, malformed-input
too large hex number	validation	error	http, parsing, chunked-encoding, protocol-violation
fasthttp: missing location header for http redirect	exception	error	http, redirect, client
fasthttp: too many redirects detected when doing the request	exception	error	http, redirect, client, loop
fasthttp: cannot follow a body-preserving redirect for a req	exception	error	http, redirect, streaming, request-body
fasthttp: hostclient can't follow redirects to a different p	exception	error	http, redirect, tls, client
fasthttp: no free connections available to host	exception	error	network, connection-pool, client, concurrency
fasthttp: the server closed connection before returning the	exception	error	network, keep-alive, connection-closed, client
fasthttp: connection pool strategy is not implement	exception	error	configuration, connection-pool, client
fasthttp: tls handshake timed out	exception	error	tls, timeout, network, client
dialling unsuccessful: please report this bug	exception	error	dial, bug, client, programming-error
fasthttp: pipelined requests' queue has been overflowed. inc	exception	error	fasthttp, pipelining, backpressure, network
pipeline connection has been stopped	exception	error	fasthttp, pipelining, connection-closed, shutdown
fasthttp: no cookies found	exception	info	fasthttp, cookies, parsing
fasthttp: invalid cookie value	validation	warning	fasthttp, cookies, validation, parsing
proxy: unknown scheme:	exception	error	fasthttp, proxy, configuration, network
dont support the network:	exception	error	fasthttp, proxy, dialer, network
fasthttputil: inmemorylistener is already closed: use of clo	exception	info	fasthttputil, inmemory, listener, shutdown
fasthttputil: connection closed	exception	warning	fasthttputil, pipe, connection-closed, network
must implement seek	exception	error	fasthttp, filesystem, range-requests, seeker
must implement readat	exception	error	go, fasthttp, filesystem, readerat
directory index required	exception	info	go, fasthttp, filesystem, directory-listing
no 'create file' permissions	exception	warning	go, fasthttp, filesystem, permissions
seek is not implemented	exception	error	go, fasthttp, compression, io-seeker
fasthttp: contain forbidden trailer	exception	error	go, fasthttp, http, headers, trailer
fasthttp: error when reading response headers	exception	error	go, fasthttp, http, response-parsing
fasthttp: error when reading response trailer	exception	error	go, fasthttp, http, trailer, chunked
fasthttp: cannot find whitespace in the first line of respon	exception	error	network, http, fasthttp, response-parsing
fasthttp: unexpected char at the end of status code	exception	error	network, http, fasthttp, response-parsing
fasthttp: cannot find http request method	exception	error	http, fasthttp, request-validation
fasthttp: unsupported http request method	exception	error	http, fasthttp, request-validation
fasthttp: extra whitespace in request line	exception	error	http, fasthttp, request-parsing, security
fasthttp: requesturi cannot be empty	exception	error	http, fasthttp, request-validation
fasthttp: duplicate content-length header	exception	error	http, fasthttp, header-parsing, security
fasthttp: unsupported transfer-encoding	exception	error	http, fasthttp, header-parsing, transfer-encoding
fasthttp: non-numeric chars found	exception	error	http, fasthttp, header-parsing, validation
fasthttp: need more data: cannot find trailing lf	exception	warning	http, fasthttp, streaming, parsing
fasthttp: small read buffer. increase readbuffersize	exception	error	http, buffer-size, fasthttp, header-parsing
too many transfer-encoding headers	exception	error	http, header-parsing, request-smuggling, security
too many host headers	exception	error	http, header-parsing, host-header, security
invalid headers, headers cannot start with space or tab	validation	error	http, malformed-headers, fasthttp, parser
fasthttp: unsupported content-encoding	exception	error	http, compression, content-encoding, fasthttp
fasthttp: request content-type has bad boundary or is not mu	exception	error	http, multipart, content-type, fasthttp
form boundary cannot be empty	validation	error	http, multipart, boundary, fasthttp
fasthttp: non-get request received	exception	error	http, fasthttp, method-not-allowed, server-config
missing required host header in request	validation	error	http, host-header, request-serialization
non-zero body for non-post request	validation	error	http, request-body, request-reuse
fasthttp: body size exceeds the given limit	exception	error	http, body-limit, payload-size
cannot find crlf at the end of chunk	exception	error	http, chunked-encoding, protocol-violation
invalid character '\n' after chunk size	exception	error	http, chunked-encoding, request-smuggling, security
invalid ipv6 host	validation	error	ipv6, uri, host-header
invalid ipv6 zone	validation	error	ipv6, uri, zone-id
invalid ipv6 address	validation	error	ipv6, uri, address-validation
fasthttp: no available clients	exception	error	load-balancing, client-pool, configuration
prefork: exceeding the value of recoverthreshold	exception	error	prefork, process-management, crash-loop
prefork: windows only supports reuseport = true	exception	error	prefork, windows, configuration
prefork: commandproducer returned nil command	exception	error	prefork, commandproducer, exec
prefork: commandproducer must return a started command	exception	error	prefork, commandproducer, exec
cert or key has not provided	validation	error	tls, certificate, server
fasthttp: there is no uploaded file associated with the give	error_code	error	multipart, file-upload, http
fasthttp: too many connections per ip	error_code	warning	server, connection-limit, rate-limiting
fasthttp: cannot serve the connection because server.concurr	error_code	warning	server, concurrency, backpressure
cannot write timed out response	exception	error	timeout, request-context, http
cannot compress data due to high load	exception	warning	compression, high-load, stackless
fasthttp: dialing to the given tcp address timed out	error_code	error	network, timeout, dial, tcp
couldn't find dns entries for the given domain: try using du	exception	error	network, dns, tcp, ipv6
only tcp, tcp4, or tcp6 is supported	validation	error	network, tcp, listener, validation
value is negative, cannot convert to uint32	validation	error	network, ipv6, integer-overflow, validation
value exceeds uint32 max value	validation	error	network, ipv6, integer-overflow, validation
value is negative, cannot convert to uintptr	validation	error	network, tcp, syscall, validation
cannot parse ip string %q: %w	validation	error	go, parsing, ipv4, input-validation
invalid host %q: use a host client for multiple hosts	validation	error	go, fasthttp, http-client, url-validation
unsupported protocol %q. http and https are supported	validation	error	go, fasthttp, http-client, scheme
cannot determine tls server name from addr %q: %w	exception	error	go, tls, sni, fasthttp
too much data gunzipped: %d	validation	error	go, gzip, decompression, memory-limit
too much data inflated: %d	validation	error	go, deflate, decompression, memory-limit
cannot parse r=%q: %w	validation	error	go, regexp, expvar, query-param
proxy dial target address contains cr or lf: %q	validation	error	go, http-proxy, security, crlf-injection
could not connect to proxy addr: %s status code: %d	exception	error	network, proxy, http-connect, fasthttp
cannot open already opened file: %w	exception	error	filesystem, io, fasthttp, file-server
unsupported range units: %q: expecting %q	validation	warning	http, range-header, validation, fasthttp
missing byte range in %q	validation	warning	http, range-header, validation, fasthttp
missing the end position of byte range in %q	validation	warning	http, range-header, validation, fasthttp
byte range %q is invalid for empty content	validation	warning	http, range-header, empty-content, fasthttp
the start position of byte range cannot exceed %d. byte rang	validation	warning	http, range-header, resume-download, fasthttp
the start position of byte range cannot exceed the end posit	validation	warning	http, range-header, validation, fasthttp
cannot open file %q: %w	exception	error	filesystem, permissions, file-server, fasthttp
cannot access directory without index page: directory %q	exception	warning	config, file-server, directory-index, fasthttp
cannot obtain info for file %q: %w	exception	error	filesystem, fasthttp, file-metadata, stat
cannot determine absolute path for %q: %v	exception	error	filesystem, fasthttp, filepath, compression-cache
cannot create temporary file for %q: %w	exception	error	filesystem, fasthttp, compression, temp-file, permissions
error when compressing file %q to %q: %w	exception	error	filesystem, fasthttp, compression, io-error
cannot change modification time to %v for tmp file %q: %v	exception	warning	filesystem, fasthttp, compression, file-timestamps
cannot move compressed file from %q to %q: %w	exception	error	filesystem, fasthttp, compression, rename, cache
error when compressing file %q: %w	exception	error	fasthttp, compression, memory, in-memory-cache
cannot read header of the file %q: %w	exception	error	fasthttp, content-type, mime, file-reading
cannot open compressed file %q: %w	exception	error	fasthttp, filesystem, compression-cache, file-open
cannot obtain info for compressed file %q: %w	exception	error	fasthttp, filesystem, stat, compression-cache, race-condition
directory with unexpected suffix found: %q: suffix: %q	exception	error	filesystem, fasthttp, compression, static-files
cannot obtain info for original file %q: %w	exception	error	filesystem, fasthttp, compression
too big file: %d bytes	exception	error	filesystem, fasthttp, int-overflow, static-files
error when reading response headers: %w	exception	error	network, fasthttp, headers, buffer-size
error when reading response trailer: %w	exception	error	network, fasthttp, trailer, buffer-size
error when reading %s headers: %w: buffer size=%d	exception	error	network, fasthttp, headers, security
error when reading %s headers: %w: buffer size=%d, contents:	exception	error	http, header-parsing, fasthttp
error when reading request headers: %w (n=%d, reader buffere	exception	error	http, buffer-size, fasthttp
error when reading request headers: %w	exception	error	http, network, fasthttp
forbidden trailer key %q	validation	error	http, trailer, rfc7230, fasthttp
invalid trailer value %q	validation	error	http, trailer, header-validation, fasthttp
cannot find whitespace in the first line of response %q	validation	error	http, response-parsing, fasthttp
invalid response status code %q: response %q	validation	error	http, status-code, response-parsing, fasthttp
unsupported http version %q	validation	error	http, protocol-version, response-parsing, fasthttp
unsupported http version %q in %q	validation	error	http, protocol-version, response-parsing, fasthttp
unsupported transfer-encoding: %q	validation	error	http, fasthttp, transfer-encoding, protocol
cannot parse content-length: %w	exception	error	http, fasthttp, content-length, parsing
malformed mime header line: %q	exception	error	http, fasthttp, mime-header, malformed
malformed mime header: missing colon: %q	exception	error	http, fasthttp, mime-header, malformed
cannot gunzip request body: %w	exception	error	http, fasthttp, gzip, content-encoding
cannot open form file %q (%q): %w	exception	error	multipart, form-data, request-writing
error when copying form file %q (%q): %w	exception	error	multipart, io, file-read
cannot close form file %q (%q): %w	exception	error	multipart, resource-cleanup, io
error when closing multipart form writer: %w	exception	error	multipart, form-data, writer
form size must be greater than 0: given %d	validation	error	multipart, content-length, server
error when marshaling multipart form: %w	exception	error	multipart, request-marshaling
non-zero body for non-post request: body=%q	exception	error	http-method, request-body, validation
panic while writing body stream: %+v	panic	error	panic, body-stream, streaming
copied %d bytes from body stream instead of %d bytes	exception	error	content-length, body-stream, streaming
bufio read returned (%d, nil)	exception	error	fasthttp, io-reader-contract, body-read, bufio
cannot read '\r' char at the end of chunk size: %w	exception	error	fasthttp, chunked-encoding, http-protocol, truncated-body
cannot unread '\r' char at the end of chunk size: %w	exception	error	fasthttp, chunked-encoding, bufio, concurrency
invalid character %q after chunk size	exception	error	fasthttp, chunked-encoding, request-smuggling, http-protocol
cannot read %q char at the end of chunk size: %w	exception	error	fasthttp, chunked-encoding, connection-reset, truncated-body
unexpected char %q at the end of chunk size: expected %q	exception	error	fasthttp, chunked-encoding, request-smuggling, http-protocol
prefork: close inherited listener fd: %w	exception	warning	fasthttp, prefork, file-descriptor, unix
prefork: resolve %s/%s: %w	exception	error	fasthttp, prefork, tcp, address-resolution
prefork: listen tcp %s: %w	exception	error	go, network, prefork, listen-error
prefork: dup listener fd: %w	exception	error	go, prefork, file-descriptor
prefork: command producer: %w	error_code	error	go, prefork, command-producer
prefork: resolve executable: %w	error_code	error	go, prefork, executable-path
prefork: start child %q: %w	error_code	error	go, prefork, process-spawn
unexpected error when trying to remove unix socket file %q:	error_code	error	go, unix-socket, filesystem-permissions
cannot chmod %#o for %q: %w	error_code	error	go, unix-socket, chmod
cannot load tls key pair from cert file=%q and key file=%q:	error_code	error	go, tls, certificates
cannot load tls key pair from the provided cert data(%d) and	error_code	error	go, tls, embedded-certificates
cannot create listening socket: %w	error_code	error	go, network, syscall, socket
cannot make non-blocked listening socket: %w	error_code	error	network, sockets, syscall, nonblocking
cannot create listening unblocked socket: %w	error_code	critical	network, sockets, syscall, fd-limit
cannot create listening socket: %w	error_code	critical	network, sockets, zos, s390x, syscall
cannot mark listening socket close-on-exec: %w	error_code	error	network, sockets, zos, s390x, fcntl, cloexec
cannot mark listening socket nonblocking: %w	error_code	error	network, sockets, zos, s390x, nonblocking, fcntl
unexpected convert socket fd int to uintptr: %w	error_code	error	network, sockets, internal, fd
cannot enable so_reuseaddr: %w	error_code	error	network, sockets, setsockopt, reuseaddr
cannot disable nagle's algorithm: %w	error_code	error	network, tcp, nagle, setsockopt
cannot enable so_reuseport: %w	error_code	error	network, sockets, reuseport, setsockopt, kernel
cannot bind to %q: %w	error_code	critical	network, bind, port-conflict, permissions
cannot determine backlog to pass to listen(2): %w	error_code	error	network, linux, tcp, backlog
cannot listen on %q: %w	error_code	error	network, linux, tcp, listen-syscall
unexpected convert net interface index int to uint32: %w	error_code	error	network, ipv6, zone-id, integer-overflow
cannot enable tcp_defer_accept: %s	error_code	error	linux, tcp, defer-accept, sockopt
cannot enable tcp_fastopen(qlen=%d): %s	error_code	error	linux, tcp, tcp-fastopen, sockopt, sysctl
cannot parse somaxconn %q read from %s: %s	error_code	error	linux, sysctl, somaxconn, parsing, backlog
invalid scheme %q	validation	error	uri, parsing, scheme, validation
invalid port %q after host	validation	error	uri, parsing, port, ipv6, validation
invalid host %q	validation	error	uri, parsing, host, validation
invalid host %q with multiple port delimiters	validation	error	url-parsing, net-url, host-validation
too much data unzstd: %d	error_code	error	zstd, fasthttp, body-size-limit, decompression
invalid WriteHeader code %v	panic	error	fasthttp, net-http-adaptor, status-code, panic