How to concatenate strings in twig

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This should work fine:

{{ 'http://' ~ app.request.host }}

To add a filter – like ‘trans’ – in the same tag use

{{ ('http://' ~ app.request.host) | trans }}

As Adam Elsodaney points out, you can also use string interpolation, this does require double quoted strings:

{{ "http://#{app.request.host}" }}

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