Hello. The full request / response is below it. Thanks.
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="
http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="
http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://
www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://
schemas.xmlsoap.org/soap/encoding/">
<soap:Header>
<RequestHeader xmlns="
https://adwords.google.com/api/adwords/o/
v200909">
<authToken>X</authToken>
<useragent>X</useragent>
<developerToken>X</developerToken>
<applicationToken>X</applicationToken>
</RequestHeader>
</soap:Header>
<soap:Body>
<get xmlns="
https://adwords.google.com/api/adwords/o/v200909">
<selector>
<searchParameters xmlns="
https://adwords.google.com/api/
adwords/" xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance"
xsi:type="RelatedToKeywordSearchParameter">
<keywords>
<text>awesome domain</text>
<matchType>Broad</matchType>
</keywords>
</searchParameters>
<ideaType>KEYWORD</ideaType>
<requestType>IDEAS</requestType>
<paging>
<startIndex>1</startIndex>
<numberResults>200</numberResults>
</paging>
</selector>
</get>
</soap:Body>
</soap:Envelope>
<soap:Envelope xmlns:soap="
http://schemas.xmlsoap.org/soap/
envelope/"><soap:Body><soap:Fault><faultcode>soap:Server</
faultcode><faultstring>authToken is missing in SoapHeader. while
invoking public abstract
com.google.ads.api.services.targetingideas.v200909.jaxbgen.TargetingIdeaPage
com.google.ads.api.services.targetingideas.v200909.jaxbgen.TargetingIdeaServiceInterface.get
(com.google.ads.api.services.targetingideas.v200909.jaxbgen.TargetingIdeaSelector)
throws
com.google.ads.api.services.targetingideas.v200909.jaxbgen.ApiException_Exception
with params
[com.google.ads.api.services.targetingideas.v200909.jaxbgen.TargetingIdeaSelector@132a040].</
faultstring></soap:Fault></soap:Body></soap:Envelope>