@Test
public void getHeaderFieldKeyInt() {

	assertEquals("content-type", this.connection.getHeaderFieldKey(0));  //$NON-NLS-1$
	assertEquals("content-length", this.connection.getHeaderFieldKey(1));  //$NON-NLS-1$
	assertEquals("last-modified", this.connection.getHeaderFieldKey(2));  //$NON-NLS-1$
	assertNull(this.connection.getHeaderFieldKey(3));
}