Want to get full change history of source code (without limitation of 100)

Hello,
I try to get the full change history of a source code file. We use RTC 4.0.1.
In the beginning I used the service that the RTC Webclient uses (IScmRestService#history) but it limits every result to 100 changes.
Later I found out, that there is a IScmRestService2#historyPlus service, which I can pass a parameter for the number of results, but you guessed it.... it's also limited to 100. I can pass parameters under 100 and they are accepted, but the maximum is 100.

So I asked some developers and they told me that the service I try to call is exclusively for the Webclient, so I'm struggling now with the service for the clients. The method is called IScmRichClientRestService#getItemHistory.

In the source code IScmRichClientRestService.java I see that I have to give these parameters:

-contextItemNamespace;
-contextItemType
-contextItemId
-componentItemId
-versionableItemNamespace
-versionableItemType
-versionableItemId

I try to call it like this:

https://xxxx.com:9445/jazz/service/com.ibm.team.scm.common.rest.IScmRichClientRestService/itemHistory?contextItemId=_7HsRsTvYEeOkSJ3RlXQrBQ&versionableItemType=com.ibm.team.filesystem.FileItem&versionableItemId=_-xoDMDuFEeCneON3DJueNg&componentItemId=_hGuj0DNyEeCeJNSDhXtNkg&contextItemNamespace=com.ibm.team.scm&versionableItemNamespace=com.ibm.team.scm&contextItemType=Workspace

I also tried to change the method to getitemHistory or just history, but it didn't change sth., I always get 500 Internal Server Error response. If I use POST instead of GET it returns 400 - Bad Request

Later I saw this defect https://jazz.net/jazz/web/projects/Rational%20Team%20Concert#action=com.ibm.team.workitem.viewWorkItem&id=214396
and it says that even this service limits it to 100, I couldn't test it so far, because I couldn't manage to pass the parameters correctly.

But RTC Eclipse is able to show the full change history. Are there any information how I can call the method that the RTC Eclipse Client calls?

Thanks in Advance!