After a lot of investigation I found out that the download only fails if we send a Post request to the download action via zend (I assume it overrides the self-setted headers). So I sendt the request via a java script redirect ($viewModel->addScriptBlock('window.location = "Your URL";');) and it worked.
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About the technologies asked in this question
PHP
PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license. https://www.php.net/
Zend Framework
Zend Framework is another component-based framework. It is also called the "middle tier framework". It appeared in 2006, now its most modern version is 3.0.0. It takes an object-oriented MVC approach, which is known for helping developers do their thing without distraction. https://framework.zend.com/
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