diff --git a/src/http/modules/ngx_http_gzip_filter_module.c b/src/http/modules/ngx_http_gzip_filter_module.c
index e4c343c9b..48f3dd7c7 100644
--- a/src/http/modules/ngx_http_gzip_filter_module.c
+++ b/src/http/modules/ngx_http_gzip_filter_module.c
@@ -55,44 +55,23 @@ typedef struct {
     unsigned             redo:1;
     unsigned             done:1;
     unsigned             nomem:1;
-    unsigned             gzheader:1;
     unsigned             buffering:1;
     unsigned             intel:1;
 
     size_t               zin;
     size_t               zout;
 
-    uint32_t             crc32;
     z_stream             zstream;
     ngx_http_request_t  *request;
 } ngx_http_gzip_ctx_t;
 
 
-#if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
-
-struct gztrailer {
-    uint32_t  crc32;
-    uint32_t  zlen;
-};
-
-#else /* NGX_HAVE_BIG_ENDIAN || !NGX_HAVE_NONALIGNED */
-
-struct gztrailer {
-    u_char  crc32[4];
-    u_char  zlen[4];
-};
-
-#endif
-
-
 static void ngx_http_gzip_filter_memory(ngx_http_request_t *r,
     ngx_http_gzip_ctx_t *ctx);
 static ngx_int_t ngx_http_gzip_filter_buffer(ngx_http_gzip_ctx_t *ctx,
     ngx_chain_t *in);
 static ngx_int_t ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r,
     ngx_http_gzip_ctx_t *ctx);
-static ngx_int_t ngx_http_gzip_filter_gzheader(ngx_http_request_t *r,
-    ngx_http_gzip_ctx_t *ctx);
 static ngx_int_t ngx_http_gzip_filter_add_data(ngx_http_request_t *r,
     ngx_http_gzip_ctx_t *ctx);
 static ngx_int_t ngx_http_gzip_filter_get_buf(ngx_http_request_t *r,
@@ -446,12 +425,6 @@ ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
             return ctx->busy ? NGX_AGAIN : NGX_OK;
         }
 
-        if (!ctx->gzheader) {
-            if (ngx_http_gzip_filter_gzheader(r, ctx) != NGX_OK) {
-                goto failed;
-            }
-        }
-
         rc = ngx_http_next_body_filter(r, ctx->out);
 
         if (rc == NGX_ERROR) {
@@ -643,7 +616,7 @@ ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r,
     ctx->zstream.opaque = ctx;
 
     rc = deflateInit2(&ctx->zstream, (int) conf->level, Z_DEFLATED,
-                      - ctx->wbits, ctx->memlevel, Z_DEFAULT_STRATEGY);
+                      ctx->wbits + 16, ctx->memlevel, Z_DEFAULT_STRATEGY);
 
     if (rc != Z_OK) {
         ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
@@ -652,45 +625,12 @@ ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r,
     }
 
     ctx->last_out = &ctx->out;
-    ctx->crc32 = crc32(0L, Z_NULL, 0);
     ctx->flush = Z_NO_FLUSH;
 
     return NGX_OK;
 }
 
 
-static ngx_int_t
-ngx_http_gzip_filter_gzheader(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx)
-{
-    ngx_buf_t      *b;
-    ngx_chain_t    *cl;
-    static u_char  gzheader[10] =
-                               { 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 3 };
-
-    b = ngx_calloc_buf(r->pool);
-    if (b == NULL) {
-        return NGX_ERROR;
-    }
-
-    b->memory = 1;
-    b->pos = gzheader;
-    b->last = b->pos + 10;
-
-    cl = ngx_alloc_chain_link(r->pool);
-    if (cl == NULL) {
-        return NGX_ERROR;
-    }
-
-    cl->buf = b;
-    cl->next = ctx->out;
-    ctx->out = cl;
-
-    ctx->gzheader = 1;
-
-    return NGX_OK;
-}
-
-
 static ngx_int_t
 ngx_http_gzip_filter_add_data(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx)
 {
@@ -743,14 +683,9 @@ ngx_http_gzip_filter_add_data(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx)
 
     } else if (ctx->in_buf->flush) {
         ctx->flush = Z_SYNC_FLUSH;
-    }
 
-    if (ctx->zstream.avail_in) {
-
-        ctx->crc32 = crc32(ctx->crc32, ctx->zstream.next_in,
-                           ctx->zstream.avail_in);
-
-    } else if (ctx->flush == Z_NO_FLUSH) {
+    } else if (ctx->zstream.avail_in == 0) {
+        /* ctx->flush == Z_NO_FLUSH */
         return NGX_AGAIN;
     }
 
@@ -932,13 +867,11 @@ static ngx_int_t
 ngx_http_gzip_filter_deflate_end(ngx_http_request_t *r,
     ngx_http_gzip_ctx_t *ctx)
 {
-    int                rc;
-    ngx_buf_t         *b;
-    ngx_chain_t       *cl;
-    struct gztrailer  *trailer;
+    int           rc;
+    ngx_chain_t  *cl;
 
     ctx->zin = ctx->zstream.total_in;
-    ctx->zout = 10 + ctx->zstream.total_out + 8;
+    ctx->zout = ctx->zstream.total_out;
 
     rc = deflateEnd(&ctx->zstream);
 
@@ -960,50 +893,7 @@ ngx_http_gzip_filter_deflate_end(ngx_http_request_t *r,
     *ctx->last_out = cl;
     ctx->last_out = &cl->next;
 
-    if (ctx->zstream.avail_out >= 8) {
-        trailer = (struct gztrailer *) ctx->out_buf->last;
-        ctx->out_buf->last += 8;
-        ctx->out_buf->last_buf = 1;
-
-    } else {
-        b = ngx_create_temp_buf(r->pool, 8);
-        if (b == NULL) {
-            return NGX_ERROR;
-        }
-
-        b->last_buf = 1;
-
-        cl = ngx_alloc_chain_link(r->pool);
-        if (cl == NULL) {
-            return NGX_ERROR;
-        }
-
-        cl->buf = b;
-        cl->next = NULL;
-        *ctx->last_out = cl;
-        ctx->last_out = &cl->next;
-        trailer = (struct gztrailer *) b->pos;
-        b->last += 8;
-    }
-
-#if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED)
-
-    trailer->crc32 = ctx->crc32;
-    trailer->zlen = ctx->zin;
-
-#else
-
-    trailer->crc32[0] = (u_char) (ctx->crc32 & 0xff);
-    trailer->crc32[1] = (u_char) ((ctx->crc32 >> 8) & 0xff);
-    trailer->crc32[2] = (u_char) ((ctx->crc32 >> 16) & 0xff);
-    trailer->crc32[3] = (u_char) ((ctx->crc32 >> 24) & 0xff);
-
-    trailer->zlen[0] = (u_char) (ctx->zin & 0xff);
-    trailer->zlen[1] = (u_char) ((ctx->zin >> 8) & 0xff);
-    trailer->zlen[2] = (u_char) ((ctx->zin >> 16) & 0xff);
-    trailer->zlen[3] = (u_char) ((ctx->zin >> 24) & 0xff);
-
-#endif
+    ctx->out_buf->last_buf = 1;
 
     ctx->zstream.avail_in = 0;
     ctx->zstream.avail_out = 0;