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diff --git a/UPGRADE b/UPGRADE
index 5e21c892..e19e6239 100644
--- a/UPGRADE
+++ b/UPGRADE
@@ -39,6 +39,9 @@ Upgrading from v3.1.x
uppercase P). Using capital letters for the initial letter of the directories name is a long-time
convention in prado, and this has been changed to reflect it. TPageService has been patched anyway to
support even the old "Application.pages" to avoid breaking existing code.
+- All the THttpRequest's methods used to gather server informations have been paired to return null if no
+ information is available. Previously some of them returned an empty string (getQueryString and
+ getHttpProtocolVersion), some other returned null, others caused a php NOTICE.
Upgrading from v3.1.10
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