diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index be0121e..ef2c92b 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -669,17 +669,8 @@
             return;
         }
 
-#if (NGX_DEBUG)
-        {
-        ngx_str_t  s;
-
-        s.len = rn->nlen;
-        s.data = rn->name;
-
-        ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0,
-                       "resolver expire \"%V\"", &s);
-        }
-#endif
+        ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
+                       "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name);
 
         ngx_queue_remove(q);
 
@@ -783,17 +774,9 @@
             return rn->expire - now;
         }
 
-#if (NGX_DEBUG)
-        {
-        ngx_str_t  s;
-
-        s.len = rn->nlen;
-        s.data = rn->name;
-
-        ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0,
-                   "resolver resend \"%V\" %p", &s, rn->waiting);
-        }
-#endif
+        ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0,
+                       "resolver resend \"%*s\" %p",
+                       (size_t) rn->nlen, rn->name, rn->waiting);
 
         ngx_queue_remove(q);
 
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index ec31673..0849668 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -880,16 +880,9 @@
         b->last = e.pos;
     }
 
-#if (NGX_DEBUG)
-    {
-    ngx_str_t  s;
-
-    s.len = b->last - b->pos;
-    s.data = b->pos;
-    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
-                   "http proxy header:\n\"%V\"", &s);
-    }
-#endif
+    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "http proxy header:\n\"%*s\"",
+                   (size_t) (b->last - b->pos), b->pos);
 
     if (plcf->body_set == NULL && plcf->upstream.pass_request_body) {
 
diff --git a/src/http/ngx_http_copy_filter_module.c b/src/http/ngx_http_copy_filter_module.c
index 3069779..3b1a3a7 100644
--- a/src/http/ngx_http_copy_filter_module.c
+++ b/src/http/ngx_http_copy_filter_module.c
@@ -121,11 +121,8 @@
             r->out = ctx->in;
         }
 
-#if (NGX_DEBUG)
         ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                        "copy filter: %i \"%V?%V\"", rc, &r->uri, &r->args);
-#endif
-
     }
 
     return rc;
diff --git a/src/http/ngx_http_header_filter_module.c b/src/http/ngx_http_header_filter_module.c
index 63ecfa1..6e80f09 100644
--- a/src/http/ngx_http_header_filter_module.c
+++ b/src/http/ngx_http_header_filter_module.c
@@ -521,10 +521,8 @@
         *b->last++ = CR; *b->last++ = LF;
     }
 
-#if (NGX_DEBUG)
-    *b->last = '\0';
-    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "%s\n", b->pos);
-#endif
+    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "%*s\n", (size_t) (b->last - b->pos), b->pos);
 
     /* the end of HTTP header */
     *b->last++ = CR; *b->last++ = LF;