Mailto chrome does not skip forward email and report error

want to use mailto to achieve a front-end chrome email function, checked the information under the outlook, but the chrome does not jump and report an error

Code

<a href="mailto:xxxx@xxxx.org"></a>

chrome

Sep.01,2021

use this chrome://net-internals to view the process of the request.
what do you mean by "CAUTION: Provisional headers are shown" in the request "CAUTION: Provisional headers are shown" in
Chrome"?

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