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via htmlunit by madaval
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java.lang.IllegalArgumentException: The content cannot be null	at org.apache.commons.httpclient.methods.StringRequestEntity.(StringRequestEntity.java:93)	at com.gargoylesoftware.htmlunit.HttpWebConnection.makeHttpMethod(HttpWebConnection.java:255)	at com.gargoylesoftware.htmlunit.HttpWebConnection.getResponse(HttpWebConnection.java:97)