[BUG] ETLClient createDataExtensionDataRow have too long size of the request headers for field User-Agent and request failed

[hktv-tonyNg]

Describe the bug
There is bug that when using SDK method com.exacttarget.fuelsdk.ETDataExtension#insert(java.util.List<com.exacttarget.fuelsdk.ETDataExtensionRow>) to insert multiple DataExtensionRow will generate very long header value of User-Agent field and cause API return 400 Bad Request, then no DataExtensionRow can be inserted.

I am following the test case https://github.com/salesforce-marketingcloud/FuelSDK-Java/blob/master/src/test/java/com/exacttarget/fuelsdk/ETDataExtensionTest.java#L258 to try create more than 1005 dataExtensionRow in 1 call, but the API return exception

Caused by: org.apache.cxf.transport.http.HTTPException: HTTP response '400: Bad Request' when communicating with https://mc9gcnjg01hzkm7nhqwz1k0nk1z0.soap.marketingcloudapis.com/service.asmx

I enable the debug level for FuelSDK and found that the SOAP call request header have very long value like:

FuelSDK-Java-v1.5.0-SOAP-create-DataExtensionRowDataExtensionRow....(repeat)...DataExtensionRowDataExtensionRow (Please find attached log for detail java exception, line 1030)

Then i try simulate the raw soap call with POSTMAN and below error return by salesforce API

Sample postman collection is attached. test_DataExtensionRow_header_postman.txt

To Reproduce
1 create ETDataExtension using the test code
2 loop to build size of list of ETDataExtensionRow more than 1005
3 call ETDataExtension.insert(List ETDataExtensionRow)
4 server return 400 bad request

Expected behavior
The API com.exacttarget.fuelsdk.ETDataExtension#insert(java.util.List<com.exacttarget.fuelsdk.ETDataExtensionRow>) can invoke and insert more than 1005 row in 1 API call.

Screenshots
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Code snippet
Please check https://gist.github.com/hktv-tonyNg/03ca278ebe13f56d6a56cbe4436362d8

Note: Because the developers need to copy and paste the code snippet, including a code snippet as a media file (e.g. gif) is not sufficient.

Environment

• SDK Version [e.g. 1.1.0]

       <dependency>
            <groupId>com.github.salesforce-marketingcloud</groupId>
            <artifactId>fuelsdk</artifactId>
            <version>1.5.1</version>
        </dependency>

• Java/ JDK version
  11.0.7

The bug has the severity

• [X ] Critical: The defect affects critical functionality or critical data. It does not have a workaround.
• [] Major: The defect affects major functionality or major data. It has a workaround but is not obvious and is difficult.
• Minor: The defect affects minor functionality or non-critical data. It has an easy workaround.
• Trivial: The defect does not affect functionality or data. It does not even need a workaround. It does not impact productivity or efficiency. It is merely an inconvenience.

Additional context
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