修复代理与日志链路的可靠性问题

tests/config/config_test.go

@@ -1,7 +1,9 @@
 package config_test
 
 import (
+	"math"
 	"net/netip"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -50,6 +52,9 @@ func TestLoadQueueDefaults(t *testing.T) {
 	if cfg.MaxBodyBytes != 1<<20 {
 		t.Fatalf("MaxBodyBytes=%d want %d", cfg.MaxBodyBytes, 1<<20)
 	}
+	if cfg.MaxRequestBytes != 16<<20 {
+		t.Fatalf("MaxRequestBytes=%d want %d", cfg.MaxRequestBytes, 16<<20)
+	}
 	if cfg.LogQueueSize != 256 {
 		t.Fatalf("LogQueueSize=%d want 256", cfg.LogQueueSize)
 	}
@@ -242,6 +247,23 @@ func TestLoadRequiresClickHouseURL(t *testing.T) {
 	}
 }
 
+func TestLoadRejectsUnsupportedUpstreamScheme(t *testing.T) {
+	t.Setenv("UPSTREAM_URL", "ftp://example.com")
+	t.Setenv("CLICKHOUSE_URL", "clickhouse://user:pass@localhost:9000/db")
+	if _, err := config.Load(); err == nil {
+		t.Fatal("Load succeeded with unsupported UPSTREAM_URL scheme")
+	}
+}
+
+func TestLoadRejectsMaxRequestBytesOverflowBoundary(t *testing.T) {
+	t.Setenv("UPSTREAM_URL", "https://example.com")
+	t.Setenv("CLICKHOUSE_URL", "clickhouse://user:pass@localhost:9000/db")
+	t.Setenv("MAX_REQUEST_BYTES", strconv.FormatInt(math.MaxInt64, 10))
+	if _, err := config.Load(); err == nil || !strings.Contains(err.Error(), "MAX_REQUEST_BYTES") {
+		t.Fatalf("Load error=%v, want MAX_REQUEST_BYTES rejection", err)
+	}
+}
+
 func TestLoadValidatesClickHouseURL(t *testing.T) {
 	tests := []struct {
 		name string