Symptoms

Fetch API sends a POST request without body parameters

Impact

Web applications do not work as expected.

Conditions

A web application uses the window.fetch() function

Workaround

You can use a custom iRule to fix this issue; there is no general iRule for this purpose. A sample iRule: XXXX is the file to be changed when REWRITE_REQUEST_DONE { if { [HTTP::path] ends_with "XXXX"} { REWRITE::post_process 1 set do_fix 1 } } when REWRITE_RESPONSE_DONE { if {[info exists do_fix]} { unset do_fix set strt [string first {<script>try} [REWRITE::payload]] if {$strt > 0} { REWRITE::payload replace $strt 0 {<script>window.fetch=void(0)</script>} } } }

Fix Information

None

Behavior Change