V3

[tarampampam]

Description

Whew, there's been a lot of work done, and I'm finding it challenging to describe all the changes made while working on v3.

Added

• You can override the default XML, JSON, or PlainText response formats using the flags --xml-format, --json-format, or --plaintext-format respectively (or their environment variables)
• Support for any HTTP request method to get the error page (previously limited to the GET method only)
• The CLI flag --send-same-http-code to respond with the same HTTP code as the requested error page code
• The CLI flag --disable-template to disable certain templates (useful when using automatic template rotation to exclude some from the available templates list)
• Ability to define custom HTTP codes using placeholders like 4**. Refer to the documentation for more information about --add-http-code

Changed

• Users can provide custom templates (themes) using the flag --add-template
• Templates are now built into the binary file
• To change the template automatically, use the new flag --rotation-mode instead of the previous "magic" template names like i-said-random or random-hourly
• Error pages can now be accessed using the following URLs: /{code}, /{code}.html, and /{code}.htm
• The default content type is now PlainText. This means that when you curl an error page, you will receive more readable content without tons of HTML tags
• Merged the l7-dark and l7-light templates (themes) into a single l7 theme
• Templates no longer download resources from external sources; everything is now embedded, including the localization script, which is now inlined into the page. Custom fonts have also been removed
• The default value for --proxy-headers is now X-Request-Id,X-Trace-Id,X-Amzn-Trace-Id
• CLI flags and environment variables are now well documented, and the readme file automatically syncs with them
• The default logs level is warn for Docker image (due to performance reasons), set it to info to get the access logs, if you need

Removed

• Configuration file is no longer needed or used. Everything is now managed using CLI flags and environment variables (the --config-file flag was removed)
• The matrix template (theme)
• The /metrics endpoint
• The --default-http-code flag (+ env variable DEFAULT_HTTP_CODE)
• The --catch-all flag (+env variable CATCH_ALL)

Closes #156 #176 #219 #274 #285

Checklist

• My code adheres to the style guidelines of this project
• I have conducted a self-review of my code
• I have added comments to my code, especially in areas that may be difficult to understand
• I have written unit tests for my code (if tests are required for my changes)