Hello!

We ran into an issue where with the permanent redirects in ngx_http_static_module.c that occur when you omit a slash when requesting a folder, for example from "/foo" to the folder "/foo/". We changed some things around in our site so that "/foo" was actually a file, not a folder, but unfortunately, browsers aggressively cache 301 redirects so our clients were trying to hit the new URL, the browser used its permanent cache, and they'd be redirected to "/foo/" again, which no longer existed as it had been changed to a file.

This patch adds an extra configuration directive that allows you to configure that redirect to issue a 302 instead:

# HG changeset patch
# User Blake Williams <code@shabbyrobe.org>
# Date 1567294381 -36000
# Sun Sep 01 09:33:01 2019 +1000
# Node ID 85c36c3f5c349a83b1b397a8aad2d11bf6a0875a
# Parent 9f1f9d6e056a4f85907957ef263f78a426ae4f9c
Add slash_redirect_temporary directive to core

diff -r 9f1f9d6e056a -r 85c36c3f5c34 contrib/vim/syntax/nginx.vim
--- a/contrib/vim/syntax/nginx.vim Mon Aug 19 15:16:06 2019 +0300
+++ b/contrib/vim/syntax/nginx.vim Sun Sep 01 09:33:01 2019 +1000
@@ -571,6 +571,7 @@
syn keyword ngxDirective contained session_log_format
syn keyword ngxDirective contained session_log_zone
syn keyword ngxDirective contained set_real_ip_from
+syn keyword ngxDirective contained slash_redirect_temporary
syn keyword ngxDirective contained slice
syn keyword ngxDirective contained smtp_auth
syn keyword ngxDirective contained smtp_capabilities
diff -r 9f1f9d6e056a -r 85c36c3f5c34 src/http/modules/ngx_http_static_module.c
--- a/src/http/modules/ngx_http_static_module.c Mon Aug 19 15:16:06 2019 +0300
+++ b/src/http/modules/ngx_http_static_module.c Sun Sep 01 09:33:01 2019 +1000
@@ -188,7 +188,11 @@
r->headers_out.location->value.len = len;
r->headers_out.location->value.data = location;

- return NGX_HTTP_MOVED_PERMANENTLY;
+ if (!clcf->slash_redirect_temporary) {
+ return NGX_HTTP_MOVED_PERMANENTLY;
+ } else {
+ return NGX_HTTP_MOVED_TEMPORARILY;
+ }
}

#if !(NGX_WIN32) /* the not regular files are probably Unix specific */
diff -r 9f1f9d6e056a -r 85c36c3f5c34 src/http/ngx_http_core_module.c
--- a/src/http/ngx_http_core_module.c Mon Aug 19 15:16:06 2019 +0300
+++ b/src/http/ngx_http_core_module.c Sun Sep 01 09:33:01 2019 +1000
@@ -520,6 +520,13 @@
offsetof(ngx_http_core_loc_conf_t, satisfy),
&ngx_http_core_satisfy },

+ { ngx_string("slash_redirect_temporary"),
+ NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
+ ngx_conf_set_flag_slot,
+ NGX_HTTP_LOC_CONF_OFFSET,
+ offsetof(ngx_http_core_loc_conf_t, slash_redirect_temporary),
+ NULL },
+
{ ngx_string("internal"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
ngx_http_core_internal,
@@ -3443,6 +3450,8 @@
clcf->open_file_cache_errors = NGX_CONF_UNSET;
clcf->open_file_cache_events = NGX_CONF_UNSET;

+ clcf->slash_redirect_temporary = NGX_CONF_UNSET;
+
#if (NGX_HTTP_GZIP)
clcf->gzip_vary = NGX_CONF_UNSET;
clcf->gzip_http_version = NGX_CONF_UNSET_UINT;
@@ -3727,6 +3736,9 @@

ngx_conf_merge_sec_value(conf->open_file_cache_events,
prev->open_file_cache_events, 0);
+
+ ngx_conf_merge_value(conf->slash_redirect_temporary,
+ prev->slash_redirect_temporary, 0);
#if (NGX_HTTP_GZIP)

ngx_conf_merge_value(conf->gzip_vary, prev->gzip_vary, 0);
diff -r 9f1f9d6e056a -r 85c36c3f5c34 src/http/ngx_http_core_module.h
--- a/src/http/ngx_http_core_module.h Mon Aug 19 15:16:06 2019 +0300
+++ b/src/http/ngx_http_core_module.h Sun Sep 01 09:33:01 2019 +1000
@@ -433,6 +433,8 @@
ngx_uint_t types_hash_max_size;
ngx_uint_t types_hash_bucket_size;

+ ngx_flag_t slash_redirect_temporary;
+
ngx_queue_t *locations;

#if 0
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