External API Request - Adding arbitrary string data before the JSON.

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Hi, I am using the External API Request function and it works fine when loading JSON parameters. However I am hoping to see if I can add some arbitary string data BEFORE the JSON paramters are sent. The remote location can happily receive a string before the JSON data.

For example, I am trying to add the word WARN as a string to the message below:

WARN {"a":123,"b":456}

but find the External API Request function ignores any string I place first and keeps loading the parameters like below, which is its normal function. Any suggestions, thanking you.

{"a":123,"b":456}

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