article RUM feature &quot;Use Proxy API for XHRs&quot; breaks application functionality. in Troubleshooting https://community.dynatrace.com/t5/Troubleshooting/RUM-feature-quot-Use-Proxy-API-for-XHRs-quot-breaks-application/ta-p/294708 <P><LI-TOC indent="15" liststyle="disc" maxheadinglevel="2"></LI-TOC></P> <DIV class="lia-message-template-content-zone"> <H2>&nbsp;</H2> <H2>Summary</H2> <DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Some Real User Monitoring (RUM) - instrumented applications may show empty page sections because <STRONG>XHR requests are never triggered</STRONG>, preventing required content from loading.</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">This behavior may occur when the <STRONG>“Use Proxy API for XHRs”</STRONG> feature in related RUM application is enabled.</DIV> </DIV> <H2>&nbsp;</H2> <H2>Problem</H2> <DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">The new Proxy API–based XHR wrapper introduced with the <STRONG>“Use Proxy API for XHRs”</STRONG> feature can break in environments where:</DIV> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">The application <STRONG>overrides the global <CODE>Map</CODE> object</STRONG>, and</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">The implementation is <STRONG>not specification‑compliant</STRONG>.</LI> </UL> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">This causes the Proxy XHR wrapper to fail silently, blocking XHR execution.</DIV> </DIV> <H2>&nbsp;</H2> <H2>Troubleshooting steps</H2> <DIV> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf"><STRONG>Disable</STRONG> the “Use Proxy API for XHRs” feature.</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Verify whether the application overrides the global <CODE>Map</CODE> object by running&nbsp;&nbsp;<CODE>dT_.gdi()</CODE>&nbsp;command in browser console.</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Check for warnings related to <CODE>Map</CODE>.</LI> </UL> </DIV> <span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="KiranSomanatti_0-1770970719515.png" style="width: 605px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/32006i1A51E8A4CE8BD074/image-dimensions/605x183?v=v2" width="605" height="183" role="button" title="KiranSomanatti_0-1770970719515.png" alt="KiranSomanatti_0-1770970719515.png" /></span> <P><SPAN>If that is true, and application has non spec compliant implementation of the </SPAN><CODE class="_ca0qyh40 _u5f3m5ip _n3tdyh40 _19bvm5ip _2rkofajl _11c819w5 _1reo1wug _18m91wug _1dqoglyw _1e0c1nu9 _bfhk187e _16d9qvcn _syazi7uo _vwz41kw7 _1i4q1hna _o5721jtm" data-renderer-mark="true">Map</CODE><SPAN> object, the Proxy XHR wrapper will not work.</SPAN></P> <H2>&nbsp;</H2> <H2>Resolution</H2> <DIV> <H4>&nbsp;</H4> <H4><STRONG>Option 1 (Recommended long‑term fix)</STRONG></H4> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Ensure the monitored application's global <CODE>Map</CODE> implementation is compliant with&nbsp;<A href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map" target="_blank" rel="noopener">Map object specification</A>. A compliant <CODE>Map</CODE> allows the Proxy XHR wrapper to function correctly.</DIV> </DIV> <DIV> <H4>&nbsp;</H4> <H4><STRONG>Option 2 (Immediate workaround)</STRONG></H4> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Disable the <STRONG>“Use Proxy API for XHRs”</STRONG> feature and rely on the <STRONG>Basic XHR module </STRONG>(<EM>Capture XmlHttpRequest (XHR)&nbsp;</EM>option).</DIV> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">No loss of XHR capture</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Page content renders normally</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Only the wrapping mechanism changes</LI> </UL> </DIV> <H2>&nbsp;</H2> <H2>What's next</H2> <P>If this article did not help, please open a support ticket, mention that this article was used and provide the following in the ticket:</P> <DIV class="p-client_container"> <DIV class="p-ia4_client_container"> <DIV class="p-ia4_client p-ia4_client--with-search-in-top-nav p-ia4_client--workspace-switcher-rail-visibletest p-ia4_client--sidebar-wide p-ia4_client--narrow-feature-on"> <DIV class="p-client_workspace_wrapper" role="tabpanel" aria-label="Dynatrace"> <DIV class="p-client_workspace" role="tabpanel" aria-label="DMs"> <DIV class="p-client_workspace__layout"> <DIV class="active-managed-focus-container" role="none"> <DIV class="p-view_contents p-view_contents--primary" tabindex="-1" role="dialog" aria-label="Conversation with Anton Konikov"> <DIV class="tabbed_channel__Abx5r"> <DIV class="tabbed_channel__Abx5r"> <DIV class="channel_tab_panel__zJ5Bt c-tabs__tab_panel c-tabs__tab_panel--active c-tabs__tab_panel--full_height" role="none" data-qa="tabs_content_container"> <DIV class="p-file_drag_drop__container"> <DIV class="p-workspace__primary_view_body"> <DIV class="p-message_pane p-message_pane--classic-nav p-message_pane--scrollbar-float-adjustment p-message_pane--with-bookmarks-bar" data-qa="message_pane"> <DIV role="presentation"> <DIV class="c-virtual_list c-virtual_list--scrollbar c-message_list c-message_list--floating c-message_list--dark c-scrollbar c-scrollbar--fade" role="presentation"> <DIV class="c-scrollbar__hider" role="presentation" data-qa="slack_kit_scrollbar"> <DIV class="c-scrollbar__child" role="presentation"> <DIV class="c-virtual_list__scroll_container" tabindex="-1" role="list" aria-label="Anton Konikov (direct message, active)" data-qa="slack_kit_list"> <DIV id="1734101723.604509" class="c-virtual_list__item" tabindex="0" role="listitem" data-item-key="1734101723.604509" data-qa="virtual-list-item" aria-setsize="-1"> <DIV class="c-message_kit__background p-message_pane_message__message c-message_kit__message p-message_pane_message__message--last" role="presentation" data-qa-placeholder="false" data-qa-unprocessed="false" data-qa="message_container"> <DIV class="c-message_kit__hover" role="document" data-qa-hover="true" aria-roledescription="message"> <DIV class="c-message_kit__actions c-message_kit__actions--above"> <DIV class="c-message_kit__gutter"> <DIV class="c-message_kit__gutter__right" role="presentation" data-qa="message_content"> <DIV class="c-message_kit__blocks c-message_kit__blocks--rich_text"> <DIV class="c-message__message_blocks c-message__message_blocks--rich_text" data-qa="message-text"> <DIV class="p-block_kit_renderer" data-qa="block-kit-renderer"> <DIV class="p-block_kit_renderer__block_wrapper p-block_kit_renderer__block_wrapper--first"> <DIV class="p-rich_text_block" dir="auto"> <UL class="p-rich_text_list p-rich_text_list__bullet p-rich_text_list--nested" data-border-radius-top-cap="0" data-border="1" data-indent="0" data-list-tree="true" data-stringify-type="unordered-list"> <LI data-stringify-border="1" data-stringify-indent="0">link to related RUM Application</LI> <LI data-stringify-border="1" data-stringify-indent="0">information if the&nbsp;monitored application's global <CODE>Map</CODE> implementation is compliant with&nbsp;<A href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map" target="_blank" rel="noopener">Map object specification</A>.</LI> </UL> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> Wed, 01 Apr 2026 08:02:28 GMT KiranSomanatti 2026-04-01T08:02:28Z RUM feature "Use Proxy API for XHRs" breaks application functionality. https://community.dynatrace.com/t5/Troubleshooting/RUM-feature-quot-Use-Proxy-API-for-XHRs-quot-breaks-application/ta-p/294708 <P><LI-TOC indent="15" liststyle="disc" maxheadinglevel="2"></LI-TOC></P> <DIV class="lia-message-template-content-zone"> <H2>&nbsp;</H2> <H2>Summary</H2> <DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Some Real User Monitoring (RUM) - instrumented applications may show empty page sections because <STRONG>XHR requests are never triggered</STRONG>, preventing required content from loading.</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">This behavior may occur when the <STRONG>“Use Proxy API for XHRs”</STRONG> feature in related RUM application is enabled.</DIV> </DIV> <H2>&nbsp;</H2> <H2>Problem</H2> <DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">The new Proxy API–based XHR wrapper introduced with the <STRONG>“Use Proxy API for XHRs”</STRONG> feature can break in environments where:</DIV> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">The application <STRONG>overrides the global <CODE>Map</CODE> object</STRONG>, and</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">The implementation is <STRONG>not specification‑compliant</STRONG>.</LI> </UL> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">This causes the Proxy XHR wrapper to fail silently, blocking XHR execution.</DIV> </DIV> <H2>&nbsp;</H2> <H2>Troubleshooting steps</H2> <DIV> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf"><STRONG>Disable</STRONG> the “Use Proxy API for XHRs” feature.</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Verify whether the application overrides the global <CODE>Map</CODE> object by running&nbsp;&nbsp;<CODE>dT_.gdi()</CODE>&nbsp;command in browser console.</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Check for warnings related to <CODE>Map</CODE>.</LI> </UL> </DIV> <span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="KiranSomanatti_0-1770970719515.png" style="width: 605px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/32006i1A51E8A4CE8BD074/image-dimensions/605x183?v=v2" width="605" height="183" role="button" title="KiranSomanatti_0-1770970719515.png" alt="KiranSomanatti_0-1770970719515.png" /></span> <P><SPAN>If that is true, and application has non spec compliant implementation of the </SPAN><CODE class="_ca0qyh40 _u5f3m5ip _n3tdyh40 _19bvm5ip _2rkofajl _11c819w5 _1reo1wug _18m91wug _1dqoglyw _1e0c1nu9 _bfhk187e _16d9qvcn _syazi7uo _vwz41kw7 _1i4q1hna _o5721jtm" data-renderer-mark="true">Map</CODE><SPAN> object, the Proxy XHR wrapper will not work.</SPAN></P> <H2>&nbsp;</H2> <H2>Resolution</H2> <DIV> <H4>&nbsp;</H4> <H4><STRONG>Option 1 (Recommended long‑term fix)</STRONG></H4> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Ensure the monitored application's global <CODE>Map</CODE> implementation is compliant with&nbsp;<A href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map" target="_blank" rel="noopener">Map object specification</A>. A compliant <CODE>Map</CODE> allows the Proxy XHR wrapper to function correctly.</DIV> </DIV> <DIV> <H4>&nbsp;</H4> <H4><STRONG>Option 2 (Immediate workaround)</STRONG></H4> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Disable the <STRONG>“Use Proxy API for XHRs”</STRONG> feature and rely on the <STRONG>Basic XHR module </STRONG>(<EM>Capture XmlHttpRequest (XHR)&nbsp;</EM>option).</DIV> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">No loss of XHR capture</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Page content renders normally</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Only the wrapping mechanism changes</LI> </UL> </DIV> <H2>&nbsp;</H2> <H2>What's next</H2> <P>If this article did not help, please open a support ticket, mention that this article was used and provide the following in the ticket:</P> <DIV class="p-client_container"> <DIV class="p-ia4_client_container"> <DIV class="p-ia4_client p-ia4_client--with-search-in-top-nav p-ia4_client--workspace-switcher-rail-visibletest p-ia4_client--sidebar-wide p-ia4_client--narrow-feature-on"> <DIV class="p-client_workspace_wrapper" role="tabpanel" aria-label="Dynatrace"> <DIV class="p-client_workspace" role="tabpanel" aria-label="DMs"> <DIV class="p-client_workspace__layout"> <DIV class="active-managed-focus-container" role="none"> <DIV class="p-view_contents p-view_contents--primary" tabindex="-1" role="dialog" aria-label="Conversation with Anton Konikov"> <DIV class="tabbed_channel__Abx5r"> <DIV class="tabbed_channel__Abx5r"> <DIV class="channel_tab_panel__zJ5Bt c-tabs__tab_panel c-tabs__tab_panel--active c-tabs__tab_panel--full_height" role="none" data-qa="tabs_content_container"> <DIV class="p-file_drag_drop__container"> <DIV class="p-workspace__primary_view_body"> <DIV class="p-message_pane p-message_pane--classic-nav p-message_pane--scrollbar-float-adjustment p-message_pane--with-bookmarks-bar" data-qa="message_pane"> <DIV role="presentation"> <DIV class="c-virtual_list c-virtual_list--scrollbar c-message_list c-message_list--floating c-message_list--dark c-scrollbar c-scrollbar--fade" role="presentation"> <DIV class="c-scrollbar__hider" role="presentation" data-qa="slack_kit_scrollbar"> <DIV class="c-scrollbar__child" role="presentation"> <DIV class="c-virtual_list__scroll_container" tabindex="-1" role="list" aria-label="Anton Konikov (direct message, active)" data-qa="slack_kit_list"> <DIV id="1734101723.604509" class="c-virtual_list__item" tabindex="0" role="listitem" data-item-key="1734101723.604509" data-qa="virtual-list-item" aria-setsize="-1"> <DIV class="c-message_kit__background p-message_pane_message__message c-message_kit__message p-message_pane_message__message--last" role="presentation" data-qa-placeholder="false" data-qa-unprocessed="false" data-qa="message_container"> <DIV class="c-message_kit__hover" role="document" data-qa-hover="true" aria-roledescription="message"> <DIV class="c-message_kit__actions c-message_kit__actions--above"> <DIV class="c-message_kit__gutter"> <DIV class="c-message_kit__gutter__right" role="presentation" data-qa="message_content"> <DIV class="c-message_kit__blocks c-message_kit__blocks--rich_text"> <DIV class="c-message__message_blocks c-message__message_blocks--rich_text" data-qa="message-text"> <DIV class="p-block_kit_renderer" data-qa="block-kit-renderer"> <DIV class="p-block_kit_renderer__block_wrapper p-block_kit_renderer__block_wrapper--first"> <DIV class="p-rich_text_block" dir="auto"> <UL class="p-rich_text_list p-rich_text_list__bullet p-rich_text_list--nested" data-border-radius-top-cap="0" data-border="1" data-indent="0" data-list-tree="true" data-stringify-type="unordered-list"> <LI data-stringify-border="1" data-stringify-indent="0">link to related RUM Application</LI> <LI data-stringify-border="1" data-stringify-indent="0">information if the&nbsp;monitored application's global <CODE>Map</CODE> implementation is compliant with&nbsp;<A href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map" target="_blank" rel="noopener">Map object specification</A>.</LI> </UL> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> Wed, 01 Apr 2026 08:02:28 GMT https://community.dynatrace.com/t5/Troubleshooting/RUM-feature-quot-Use-Proxy-API-for-XHRs-quot-breaks-application/ta-p/294708 KiranSomanatti 2026-04-01T08:02:28Z