Composer update: The requested PHP extension ext-http missing

The solution is found. For some reason my composer.json contained "ext-http": "*".

"require": {    "ext-http": "*"}

Removing this line fixed the problem. I don't know why it contained "ext-http": "*" and I don't fully understand why removing it would fix the problem. (Is it because it is looking for the extension, but can not find it?)

(Thank you to everyone trying to help me fix the problem!)

Update:It might be worth looking at the other answers too. I'm no longer using PHP so I can't check the correctness of these new answers.

php-http is a standard which is implemented by different packages. ext-http is the Composer way to tell that your application requires at least one of those packages. See the section called "Composer virtual packages" at http://docs.php-http.org/en/latest/clients.html for additional details.

Differently than other packages, the ext-... lines do not actually install anything via composer, they just make composer check that you have some required dependency. Usually you can just install the corresponding PHP library, e.g. ext-zip means that you need to install php-zip. In this case, there is no single PHP library but a series of compatible libraries.

You should be able to fix your issue by installing one of the provided packages, e.g.

composer require php-http/curl-client

in my case i'm using ubuntu, hope this solve the problem.

sudo apt install php-http