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[SOLVED] org.springframework.web.client.RestClientException: No HttpMessageConverter for java.util.HashMap and content type "multipart/form-data"

Error added: 2022-08-29T09:24:48Z

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		HttpHeaders headers = new HttpHeaders();
		headers.setContentType(MediaType.MULTIPART_FORM_DATA);

		MultiValueMap<String, Object> map = new LinkedMultiValueMap<>();
		map.put("username", Collections.singletonList(username));
		map.put("password", Collections.singletonList(password));
		HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(map, headers);

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