MIME type may not contain reserved characters / Internal Exception

MIME type may not contain reserved characters / Internal Exception

Good Afternoon everyone,

When I try to call SOAP request, it responses with the exception messages 'Internal Exception'

map validateXML()
{
xmlString = "";
xmlString = xmlString + "<soapenv:Envelope ";
xmlString = xmlString + "xmlns:soapenv=\" http://schemas.xmlsoap.org/soap/envelope/\" ";
xmlString = xmlString + "xmlns:ec=\" http://ec.gob.sri.ws.recepcion\">";
xmlString = xmlString + "<soapenv:Header/>";
xmlString = xmlString + "<soapenv:Body>";
xmlString = xmlString + "<ec:validarComprobante>";
xmlString = xmlString + "<xml></xml>";
xmlString = xmlString + "</ec:validarComprobante>";
xmlString = xmlString + "</soapenv:Body>";
xmlString = xmlString + "</soapenv:Envelope>";

requestHeader = map();
requestHeader.put("POST"," https://celcer.sri.gob.ec/comprobantes-electronicos-ws/RecepcionComprobantes HTTP/1.1");
requestHeader.put("Content-Type", "text/xml");
requestHeader.put("Accept-Encoding", "gzip,deflate");
requestHeader.put("SOAPAction", "\"\"");
requestHeader.put("Content-Length", xmlString.length().toString());
requestHeader.put("Host", "celcer.sri.gob.ec");
requestHeader.put("Connection", "Keep-Alive");
requestHeader.put("User-Agent", "Apache-HttpClient/4.1.1 (java 1.5)");

apiResponse = postUrl(" http://ec.gob.sri.ws.recepcion/RecepcionComprobantes/validarComprobante", xmlString, requestHeader, false);

return apiResponse;
}