web/src/main/java/org/apache/commons/chain2/web/servlet/ServletHeaderMap.java [107:116]:
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    public int size() {
        int n = 0;
        @SuppressWarnings( "unchecked" ) // it is known that header names are String
        Enumeration<String> keys = request.getHeaderNames();
        while (keys.hasMoreElements()) {
            keys.nextElement();
            n++;
        }
        return (n);
    }
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web/src/main/java/org/apache/commons/chain2/web/servlet/ServletHeaderValuesMap.java [138:147]:
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    public int size() {
        int n = 0;
        @SuppressWarnings( "unchecked" ) // it is known that header names are String
        Enumeration<String> keys = request.getHeaderNames();
        while (keys.hasMoreElements()) {
            keys.nextElement();
            n++;
        }
        return (n);
    }
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