gofiber/fiber · error · ErrFailedToAppendCert

failed to append certificate

Error message

failed to append certificate

What it means

Error "failed to append certificate" thrown in gofiber/fiber.

Source

Thrown at client/client.go:34

	"io"
	"os"
	"path/filepath"
	"slices"
	"sync"
	"sync/atomic"
	"time"

	"github.com/fxamacker/cbor/v2"
	"github.com/gofiber/fiber/v3/log"

	"github.com/gofiber/utils/v2"

	"github.com/valyala/fasthttp"
	"github.com/valyala/fasthttp/fasthttpproxy"
	"golang.org/x/net/http/httpproxy"
)

var ErrFailedToAppendCert = errors.New("failed to append certificate")

// Client provides Fiber's high-level HTTP API while delegating transport work
// to fasthttp.Client, fasthttp.HostClient, or fasthttp.LBClient implementations.
//
// Settings configured on the client are shared across every request and may be
// overridden per request when needed.
// Client is safe for concurrent request execution after configuration is
// complete. Concurrent configuration changes require external synchronization.
type Client struct {
	logger    log.CommonLogger
	transport httpClientTransport

	header  *Header
	params  *QueryParam
	cookies *Cookie
	path    *PathParam

	jsonMarshal   utils.JSONMarshal

View on GitHub (pinned to 9a4c7e57fe)

When it happens

Trigger: Thrown at client/client.go:34 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of gofiber/fiber@9a4c7e57fe (2026-08-04). Data as JSON: /data/errors/e6d4eba280f604d2.json. Report an issue: GitHub.