commons/http/src/main/java/org/ldp4j/http/MoreStrings.java
static boolean equalsIgnoreCase(final CharSequence str1, final CharSequence str2) {
		if(str1==str2) {
			return true;
		} else if(str1==null||str2==null) {
			return false;
		} else if(str1.length()!=str2.length()) {
			return false;
		} else {
			return regionMatches(str1,true,0,str2,0,str1.length());
		}
	}
static boolean equalsIgnoreCase(final CharSequence str1, final CharSequence str2) {
		if(str1==str2) {
			return true;
		} else if(str1==null||str2==null) {
			return false;
		} else if(str1.length()!=str2.length()) {
			return false;
		} else {
			return regionMatches(str1,true,0,str2,0,str1.length());
		}
	}
<p>
Compares two CharSequences, returning {@code true} if they represent
equal sequences of characters, ignoring case.
</p>

<p>
{@code null}s are handled without exceptions. Two {@code null}
references are considered equal. Comparison is case insensitive.
</p>

<pre>
equalsIgnoreCase(null, null)   = true
equalsIgnoreCase(null, "abc")  = false
equalsIgnoreCase("abc", null)  = false
equalsIgnoreCase("abc", "abc") = true
equalsIgnoreCase("abc", "ABC") = true
</pre>

@param str1
the first CharSequence, may be {@code null}
@param str2
the second CharSequence, may be {@code null}
@return {@code true} if the CharSequence are equal, case insensitive,
or both {@code null}; {@code false} otherwise