Failing to declare the type of content it accepts critical
This application is requesting feed content from websites but but doesn't specify its format.
Why it's a problemWhen a website doesn't know what format the application needs the content to be in, it has to try to guess the appropriate format, which could end up being incorrect.
What it means for usersIf the website is left to assume and ends up delivering feed content to the app in the wrong format, it can cause feeds not to display or work properly.
How to fix itThe app should declare a common feed format it accepts content in using the Accept header.