How to differentiate Ajax requests from normal Http requests?

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Ajax requests have usually a X-Requested-With: XMLHttpRequest request header. In JSF, you can obtain the request headers by ExternalContext#getRequestHeaderMap().

ExternalContext externalContext = facesContext.getExternalContext();
Map<String, String> headers = externalContext.getRequestHeaderMap();
boolean ajax = "XMLHttpRequest".equals(headers.get("X-Requested-With"));

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