1.15.1 (September 29, 2020)

• http: The setCopy() header map API previously only set the first header in the case of duplicate non-inline headers. setCopy() now behaves similarly to the other set*() APIs and replaces all found headers with a single value. This may have had security implications in the extauth filter which uses this API. This behavior can be disabled by setting the runtime value “envoy.reloadable_features.http_set_copy_replace_all_headers” to false.