Remove redundant no-arg constructors
Upgrade netty-build to 11
Prefer isEmpty() over size() == 0 or length() == 0
Remove unnecessarily qualified static access
Remove unnecessary null check before equals()
Fix a regression in HttpMessageDecoder due to a mistake during yak shaving
Remove recundant type casting
Add missing final modifiers
Remove unnecessary this, parenthesis, and semicolons
[#719] Handle http requests without an absolute path the right way when encoding them, which is adding / to it
Remove redundant throws clauses / Suppress inspections for some false positives
Suppress false positives related with utility class inspections.

IntelliJ IDEA inspection for private utility classes seems flawed.
Remove redundant field initialization
Remove various unnecessary qualifiers
Remove unused imports
Remove unnecessary throws clauses for unchecked exceptions
Remove methods overridden but identical with the super implementation / Make constructors of abstract classes protected rather than non-sense public

AbstractWrappedByteBuf.capacity(int) should raise a UnsupportedOperationException rather than ReadOnlyBufferException.
DefaultHttpDataFactory.MINSIZE must be final
Use foreach loop wherever possible / Prefer String.contains() to indexOf() >= 0 / Prefer StringUtil.split() to String.split()
Fix unchecked warnings