Fetching $_POST parameters in custom module

Hi all,

I´ve a very simple question for which I dint find documentation. 

I need to fetch the POST parameters that a external applications send to my custom module.

I read something about  \Drupal::request()->request->get('all') and  \Drupal::request()->query->get('keys') but this last one seems no to be working.

Someone could provide me a simple example of fetching $_POST parameters in a Controller class?

Thanks in advance!

Cannot uncheck (disable) modules

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I just freshly installed Drupal 8.5.4 on Acquia Dev Desktop 2 and am building a new site. I've experimented with Drupal 7 and previous versions of Drupal 8 in weeks past, and I've had no problem disabling modules in the past. However, 8.5.4 is not allowing me to disable any modules once they've been enabled. I'm a total noob, so while there might be some manual coding methods to modify the modules individually in the database, I'd much prefer remedying the cause of the problem so I can uncheck the boxes in the Extensions menu. Can anyone help?

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American Medical Association - “Topics” Pages

AMA Topics: Reinventing Medical Practice

Since 1847 the American Medical Association has promoted scientific advancement, improved public health, and invested in the doctor and patient relationship. Today, the AMA has a vision for a healthier America. Improving the health of the nation is at the core of the AMA's work to enhance the delivery of care and enable physicians and health teams to partner with patients to achieve better health for all.

Sectors: 
Healthcare
Non-profit

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Custom form and theme with redirect, no submit

Hi,

I have been struggling with a custom form likeso:

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