/src/main/java/org/htmlunit/util/UrlUtils.java
if ( baseUrl == null) {   return url; }
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final int length = scheme.length(); if (length < 1) { return false; } char c = scheme.charAt(0); boolean isValid = ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'); <extra_id_0> return false; } for (int i = 1; i < length; i++) { c = scheme.charAt(i); isValid = ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')