Add "Content-Length" in HTTP POST request header to fix notifications to MS Teams workflows #965
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…tions to MS Teams workflows
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From Spring >=6.1 the "Content-Length" header is no longer set by default when using RestTemplate to reduce memory usage. As a result, "Transfer-Encoding: chunked" is used and webhooks in MS Teams workflows do not receive the request body for requests with type application/JSON. To reenable the buffering of request bodies like before (thus setting "the Content-Length" header again), the ClientHttpRequestFactory can be wrapped in a BufferingClientHttpRequestFactory.