merge r3454, r3455, r3486, r3496, r3519, r3523:

SSI fixes:

*) use content type of the parent request in SSI stub block output
   instead of default one
*) SSI %s timefmt has no timezone offset
*) change ngx_http_ssi_filter and ngx_http_charset_filter order
*) do not store an encoded variable value as a new cached variable value
*) fix SSI include stub for valid empty responses
*) allow to use $uid_got in SSI and perl module

auto/modules

@@ -101,8 +101,8 @@ fi
 #     ngx_http_range_header_filter
 #     ngx_http_gzip_filter
 #     ngx_http_postpone_filter
-#     ngx_http_charset_filter
 #     ngx_http_ssi_filter
+#     ngx_http_charset_filter
 #         ngx_http_xslt_filter
 #         ngx_http_image_filter_filter
 #         ngx_http_sub_filter
@@ -130,12 +130,6 @@ if [ $HTTP_POSTPONE = YES ]; then
     HTTP_SRCS="$HTTP_SRCS $HTTP_POSTPONE_FILTER_SRCS"
 fi
 
-if [ $HTTP_CHARSET = YES ]; then
-    have=NGX_HTTP_CHARSET . auto/have
-    HTTP_FILTER_MODULES="$HTTP_FILTER_MODULES $HTTP_CHARSET_FILTER_MODULE"
-    HTTP_SRCS="$HTTP_SRCS $HTTP_CHARSET_SRCS"
-fi
-
 if [ $HTTP_SSI = YES ]; then
     have=NGX_HTTP_SSI . auto/have
     HTTP_FILTER_MODULES="$HTTP_FILTER_MODULES $HTTP_SSI_FILTER_MODULE"
@@ -143,6 +137,12 @@ if [ $HTTP_SSI = YES ]; then
     HTTP_SRCS="$HTTP_SRCS $HTTP_SSI_SRCS"
 fi
 
+if [ $HTTP_CHARSET = YES ]; then
+    have=NGX_HTTP_CHARSET . auto/have
+    HTTP_FILTER_MODULES="$HTTP_FILTER_MODULES $HTTP_CHARSET_FILTER_MODULE"
+    HTTP_SRCS="$HTTP_SRCS $HTTP_CHARSET_SRCS"
+fi
+
 if [ $HTTP_XSLT = YES ]; then
     USE_LIBXSLT=YES
     HTTP_FILTER_MODULES="$HTTP_FILTER_MODULES $HTTP_XSLT_FILTER_MODULE"

src/http/modules/ngx_http_ssi_filter_module.c

@@ -2061,9 +2061,9 @@ ngx_http_ssi_stub_output(ngx_http_request_t *r, void *data, ngx_int_t rc)
     out = data;
 
     if (!r->header_sent) {
-        if (ngx_http_set_content_type(r) != NGX_OK) {
-            return NGX_ERROR;
-        }
+        r->headers_out.content_type_len =
+                                      r->parent->headers_out.content_type_len;
+        r->headers_out.content_type = r->parent->headers_out.content_type;
 
         if (ngx_http_send_header(r) == NGX_ERROR) {
             return NGX_ERROR;
@@ -2161,10 +2161,9 @@ ngx_http_ssi_echo(ngx_http_request_t *r, ngx_http_ssi_ctx_t *ctx,
         }
     }
 
-    switch (ctx->encoding) {
+    p = value->data;
 
-    case NGX_HTTP_SSI_NO_ENCODING:
-        break;
+    switch (ctx->encoding) {
 
     case NGX_HTTP_SSI_URL_ENCODING:
         len = 2 * ngx_escape_uri(NULL, value->data, value->len,
@@ -2177,11 +2176,9 @@ ngx_http_ssi_echo(ngx_http_request_t *r, ngx_http_ssi_ctx_t *ctx,
             }
 
             (void) ngx_escape_uri(p, value->data, value->len, NGX_ESCAPE_HTML);
-
-            value->len += len;
-            value->data = p;
         }
 
+        len += value->len;
         break;
 
     case NGX_HTTP_SSI_ENTITY_ENCODING:
@@ -2194,11 +2191,13 @@ ngx_http_ssi_echo(ngx_http_request_t *r, ngx_http_ssi_ctx_t *ctx,
             }
 
             (void) ngx_escape_html(p, value->data, value->len);
-
-            value->len += len;
-            value->data = p;
         }
 
+        len += value->len;
+        break;
+
+    default: /* NGX_HTTP_SSI_NO_ENCODING */
+        len = value->len;
         break;
     }
 
@@ -2213,8 +2212,8 @@ ngx_http_ssi_echo(ngx_http_request_t *r, ngx_http_ssi_ctx_t *ctx,
     }
 
     b->memory = 1;
-    b->pos = value->data;
-    b->last = value->data + value->len;
+    b->pos = p;
+    b->last = p + len;
 
     cl->buf = b;
     cl->next = NULL;
@@ -2614,8 +2613,7 @@ ngx_http_ssi_date_gmt_local_variable(ngx_http_request_t *r,
             return NGX_ERROR;
         }
 
-        v->len = ngx_sprintf(v->data, "%T", tp->sec + (gmt ? 0 : tp->gmtoff))
-                 - v->data;
+        v->len = ngx_sprintf(v->data, "%T", tp->sec) - v->data;
 
         return NGX_OK;
     }

src/http/modules/ngx_http_userid_filter_module.c

@@ -545,7 +545,7 @@ ngx_http_userid_add_variables(ngx_conf_t *cf)
 {
     ngx_http_variable_t  *var;
 
-    var = ngx_http_add_variable(cf, &ngx_http_userid_got, NGX_HTTP_VAR_NOHASH);
+    var = ngx_http_add_variable(cf, &ngx_http_userid_got, 0);
     if (var == NULL) {
         return NGX_ERROR;
     }

src/http/ngx_http_copy_filter_module.c

@@ -104,7 +104,9 @@ ngx_http_copy_filter(ngx_http_request_t *r, ngx_chain_t *in)
         ctx->output_filter = (ngx_output_chain_filter_pt) ngx_http_next_filter;
         ctx->filter_ctx = r;
 
-        r->request_output = 1;
+        if (in && in->buf && ngx_buf_size(in->buf)) {
+            r->request_output = 1;
+        }
     }
 
     rc = ngx_output_chain(ctx, in);