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Knowledge Base 10

Why am I seeing "Application Error"? You are opening your application and an "Application Error" message is displayed.
How do I change the dyno types for my application? You want to change the dyno types that your application is using.
Can Heroku force an application to use SSL/TLS? You have configured an SSL endpoint and now you want your application to use https for all requests.
Can you provide me with the IP address for my application? Your DNS provider requires an IP address for a DNS A-record in their control panel for root level domains.
Does Heroku offer a Web Application Firewall (WAF)? Can I use Heroku to block/manage certain kinds of traffic in my app?
How do I install additional software packages that my application requires? Some applications or frameworks require additional software packages to be installed on the dyno, that are not part of the standard Ubuntu .
Why is my application getting bursts of H19s when it didn't before? You're seeing bursts of H19s spread out between your dynos that come and go periodically over the course of a day. Previously, you never saw errors like this coming from your application even under higher traffic loads.
Why does my Java application start swapping memory before I run out of RAM? Java Application is swapping memory even though the dyno not reached it's memory quota.
Why is my PCI compliance scan complaining about a reverse proxy? While running a PCI compliance scan against your application it gets flagged due to a "HTTP Reverse Proxy" being detected. You might see it complaining about the `Via: 1.1 vegur` header and see references to security notices like [CVE-2004-2320](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-2320), [CVE-2005-3398](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3398), [CVE-2007-3008](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3008), and [CVE-2005-3498](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3498).
Why does my application fail to build on the new heroku-18 stack? Applications fail to build on the new `heroku-18` stack (https://devcenter.heroku.com/articles/heroku-18-stack).

Dev Center articles 3

Recovering an Offline Application Detailed steps to determine why your application is unavailable and what actions to take to resolve the issue.
JawsDB Maria JawsDB is an add-on for providing a fully functional MariaDB database for use with your Heroku application.
JawsDB MySQL JawsDB is an add-on for providing a fully functional MySQL Database server for use with your Heroku application.

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