handle https://github.com/kataras/iris/issues/1875

iris.go

@@ -1,6 +1,7 @@
 package iris
 
 import (
+	"bytes"
 	stdContext "context"
 	"errors"
 	"fmt"
@@ -475,6 +476,40 @@ func (app *Application) ConfigureHost(configurators ...host.Configurator) *Appli
 	return app
 }
 
+const serverLoggerPrefix = "[HTTP Server] "
+
+type customHostServerLogger struct { // see #1875
+	parent     io.Writer
+	ignoreLogs [][]byte
+}
+
+var newLineBytes = []byte("\n")
+
+func newCustomHostServerLogger(w io.Writer, ignoreLogs []string) *customHostServerLogger {
+	prefixAsByteSlice := []byte(serverLoggerPrefix)
+
+	// build the ignore lines.
+	ignoreLogsAsByteSlice := make([][]byte, 0, len(ignoreLogs))
+	for _, s := range ignoreLogs {
+		ignoreLogsAsByteSlice = append(ignoreLogsAsByteSlice, append(prefixAsByteSlice, []byte(s)...)) // append([]byte(s), newLineBytes...)
+	}
+
+	return &customHostServerLogger{
+		parent:     w,
+		ignoreLogs: ignoreLogsAsByteSlice,
+	}
+}
+
+func (l *customHostServerLogger) Write(p []byte) (int, error) {
+	for _, ignoredLogBytes := range l.ignoreLogs {
+		if bytes.Equal(bytes.TrimSuffix(p, newLineBytes), ignoredLogBytes) {
+			return 0, nil
+		}
+	}
+
+	return l.parent.Write(p)
+}
+
 // NewHost accepts a standard *http.Server object,
 // completes the necessary missing parts of that "srv"
 // and returns a new, ready-to-use, host (supervisor).
@@ -487,9 +522,10 @@ func (app *Application) NewHost(srv *http.Server) *host.Supervisor {
 		srv.Handler = app.Router
 	}
 
-	// check if different ErrorLog provided, if not bind it with the framework's logger
+	// check if different ErrorLog provided, if not bind it with the framework's logger.
 	if srv.ErrorLog == nil {
-		srv.ErrorLog = log.New(app.logger.Printer.Output, "[HTTP Server] ", 0)
+		serverLogger := newCustomHostServerLogger(app.logger.Printer.Output, app.config.IgnoreServerErrors)
+		srv.ErrorLog = log.New(serverLogger, serverLoggerPrefix, 0)
 	}
 
 	if addr := srv.Addr; addr == "" {
@@ -913,11 +949,23 @@ func Raw(f func() error) Runner {
 	}
 }
 
-// ErrServerClosed is returned by the Server's Serve, ServeTLS, ListenAndServe,
-// and ListenAndServeTLS methods after a call to Shutdown or Close.
-//
-// A shortcut for the `http#ErrServerClosed`.
-var ErrServerClosed = http.ErrServerClosed
+var (
+	// ErrServerClosed is logged by the standard net/http server when the server is terminated.
+	// Ignore it by passing this error to the `iris.WithoutServerError` configurator
+	// on `Application.Run/Listen` method.
+	//
+	// An alias of the `http#ErrServerClosed`.
+	ErrServerClosed = http.ErrServerClosed
+
+	// ErrURLQuerySemicolon is logged by the standard net/http server when
+	// the request contains a semicolon (;) wihch, after go1.17 it's not used as a key-value separator character.
+	//
+	// Ignore it by passing this error to the `iris.WithoutServerError` configurator
+	// on `Application.Run/Listen` method.
+	//
+	// An alias of the `http#ErrServerClosed`.
+	ErrURLQuerySemicolon = errors.New("http: URL query contains semicolon, which is no longer a supported separator; parts of the query may be stripped when parsed; see golang.org/issue/25192")
+)
 
 // Listen builds the application and starts the server
 // on the TCP network address "host:port" which