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diff --git a/modules/proxy/mod_proxy.c b/modules/proxy/mod_proxy.c
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index b10be15..506a046 100644
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--- a/modules/proxy/mod_proxy.c
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+++ b/modules/proxy/mod_proxy.c
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@@ -1320,6 +1320,7 @@ static void *create_proxy_dir_config(apr_pool_t *p, char *dummy)
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     new->error_override = 0;
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     new->error_override_set = 0;
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     new->add_forwarded_headers = 1;
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+    new->add_forwarded_headers_set = 0;
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     return (void *) new;
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 }
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@@ -1350,7 +1351,12 @@ static void *merge_proxy_dir_config(apr_pool_t *p, void *basev, void *addv)
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     new->error_override_set = add->error_override_set || base->error_override_set;
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     new->alias = (add->alias_set == 0) ? base->alias : add->alias;
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     new->alias_set = add->alias_set || base->alias_set;
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-    new->add_forwarded_headers = add->add_forwarded_headers;
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+    new->add_forwarded_headers =
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+        (add->add_forwarded_headers_set == 0) ? base->add_forwarded_headers
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+        : add->add_forwarded_headers;
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+    new->add_forwarded_headers_set = add->add_forwarded_headers_set
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+        || base->add_forwarded_headers_set;
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+
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     return new;
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 }
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@@ -1837,6 +1843,7 @@ static const char *
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 {
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    proxy_dir_conf *conf = dconf;
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    conf->add_forwarded_headers = flag;
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+   conf->add_forwarded_headers_set = 1;
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    return NULL;
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 }
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 static const char *
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diff --git a/modules/proxy/mod_proxy.h b/modules/proxy/mod_proxy.h
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index 06f2b17..8c76d4c 100644
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--- a/modules/proxy/mod_proxy.h
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+++ b/modules/proxy/mod_proxy.h
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@@ -219,6 +219,7 @@ typedef struct {
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     unsigned int error_override_set:1;
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     unsigned int alias_set:1;
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     unsigned int add_forwarded_headers:1;
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+    unsigned int add_forwarded_headers_set:1;
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 } proxy_dir_conf;
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 /* if we interpolate env vars per-request, we'll need a per-request