func (rp *FastReverseProxy) handler(ctx *fasthttp.RequestCtx) {
req := &ctx.Request
resp := &ctx.Response
host := string(req.Header.Host())
uri := req.URI()
if host == "__ping__" && len(uri.Path()) == 1 && uri.Path()[0] == byte('/') {
resp.SetBody(okResponse)
return
}
reqData, err := rp.Router.ChooseBackend(host)
if err != nil {
log.LogError(reqData.String(), string(uri.Path()), err)
}
dstScheme := ""
dstHost := ""
u, err := url.Parse(reqData.Backend)
if err == nil {
dstScheme = u.Scheme
dstHost = u.Host
} else {
log.LogError(reqData.String(), string(uri.Path()), err)
}
if dstHost == "" {
dstHost = reqData.Backend
}
upgrade := req.Header.Peek("Upgrade")
if len(upgrade) > 0 && bytes.Compare(bytes.ToLower(upgrade), websocketUpgrade) == 0 {
resp.SkipResponse = true
rp.serveWebsocket(dstHost, reqData, ctx)
return
}
var backendDuration time.Duration
logEntry := func() *log.LogEntry {
proto := "HTTP/1.0"
if req.Header.IsHTTP11() {
proto = "HTTP/1.1"
}
return &log.LogEntry{
Now: time.Now(),
BackendDuration: backendDuration,
TotalDuration: time.Since(reqData.StartTime),
BackendKey: reqData.BackendKey,
RemoteAddr: ctx.RemoteAddr().String(),
Method: string(ctx.Method()),
Path: string(uri.Path()),
Proto: proto,
Referer: string(ctx.Referer()),
UserAgent: string(ctx.UserAgent()),
RequestIDHeader: rp.RequestIDHeader,
RequestID: string(req.Header.Peek(rp.RequestIDHeader)),
StatusCode: resp.StatusCode(),
ContentLength: int64(resp.Header.ContentLength()),
}
}
isDebug := len(req.Header.Peek("X-Debug-Router")) > 0
req.Header.Del("X-Debug-Router")
if dstHost == "" {
resp.SetStatusCode(http.StatusBadRequest)
resp.SetBody(noRouteResponseContent)
rp.debugHeaders(resp, reqData, isDebug)
endErr := rp.Router.EndRequest(reqData, false, logEntry)
if endErr != nil {
log.LogError(reqData.String(), string(uri.Path()), endErr)
}
return
}
if rp.RequestIDHeader != "" && len(req.Header.Peek(rp.RequestIDHeader)) == 0 {
unparsedID, err := uuid.NewV4()
if err == nil {
req.Header.Set(rp.RequestIDHeader, unparsedID.String())
} else {
log.LogError(reqData.String(), string(uri.Path()), fmt.Errorf("unable to generate request id: %s", err))
}
}
hostOnly, _, _ := net.SplitHostPort(dstHost)
if hostOnly == "" {
hostOnly = dstHost
}
isIP := net.ParseIP(hostOnly) != nil
if !isIP {
req.Header.SetBytesV("X-Host", uri.Host())
req.Header.SetBytesV("X-Forwarded-Host", uri.Host())
uri.SetHost(hostOnly)
}
client := rp.getClient(dstHost, dstScheme == "https")
t0 := time.Now().UTC()
err = client.Do(req, resp)
backendDuration = time.Since(t0)
markAsDead := false
if err != nil {
var isTimeout bool
if netErr, ok := err.(net.Error); ok {
markAsDead = !netErr.Temporary()
isTimeout = netErr.Timeout()
}
if isTimeout {
markAsDead = false
err = fmt.Errorf("request timed out after %v: %s", time.Since(reqData.StartTime), err)
} else {
err = fmt.Errorf("error in backend request: %s", err)
}
if markAsDead {
err = fmt.Errorf("%s *DEAD*", err)
}
resp.SetStatusCode(http.StatusServiceUnavailable)
log.LogError(reqData.String(), string(uri.Path()), err)
}
rp.debugHeaders(resp, reqData, isDebug)
endErr := rp.Router.EndRequest(reqData, markAsDead, logEntry)
if endErr != nil {
log.LogError(reqData.String(), string(uri.Path()), endErr)
}
}