merge r2954:
fix segfault if there is error_page 401, proxy_intercept_errors is on and backend does not return "WWW-Authenticate" header
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@ -1573,8 +1573,9 @@ ngx_http_upstream_intercept_errors(ngx_http_request_t *r,
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if (err_page[i].status == status) {
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if (status == NGX_HTTP_UNAUTHORIZED) {
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if (status == NGX_HTTP_UNAUTHORIZED
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&& u->headers_in.www_authenticate)
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{
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h = ngx_list_push(&r->headers_out.headers);
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if (h == NULL) {
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