Method makeErrorResponse

proxy/proxy.go:2016–2051

(ctx *context, perr *proxyError)

}

func (p *Proxy) makeErrorResponse(ctx *context, perr *proxyError) {
	ctx.response = &http.Response{
		Header: http.Header{},
	}

	if len(perr.additionalHeader) > 0 {
		copyHeader(ctx.response.Header, perr.additionalHeader)
	}
	addBranding(ctx.response.Header)
	ctx.response.Header.Set("Content-Type", "text/plain; charset=utf-8")
	ctx.response.Header.Set("X-Content-Type-Options", "nosniff")

	code := http.StatusInternalServerError
	switch {
	case perr == errRouteLookupFailed:
		code = p.defaultHTTPStatus
	case perr.code == -1:
		// -1 == dial connection refused
		code = http.StatusBadGateway
	case perr.code != 0:
		code = perr.code
		if perr.code == 499 {
			// https://github.com/zalando/skipper/issues/4060
			// readTimeout() hit and because of
			// https://github.com/golang/go/issues/70834
			// we need to close the underlying connection
			ctx.response.Header.Set("Connection", "close")
		}
	}

	text := http.StatusText(code) + "\n"
	ctx.response.Header.Set("Content-Length", strconv.Itoa(len(text)))
	ctx.response.StatusCode = code

	ctx.response.Body = io.NopCloser(bytes.NewBufferString(text))
}

// errorHandlerFilter is an opt-in for filters to get called
// Response(ctx) in case of errors.