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I need to slightly modify some URLs that are in a "Link" field on a custom entity type.

In a mytheme_preprocess_myentity I've found that field with $variables['elements']['field_my_url'][0] I get this output in Kint

enter image description here

I've tried using a number of methods on the #url object but I don't think I'm doing it correctly... I'm just confused on how to modify it at this point.

How can I change the external URL to which this particular field is pointing?

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Drupal's Core Url has a static fromUri() method (see https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Url.php/function/Url%3A%3AfromUri/8.2.x)

With that in mind you should be able to swap out the ['#url'] with a new one thusly:

...['#url'] = \Drupal\Core\Url::fromUri('externalURL');

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