Formatar conteúdo das requisições à API como UTF-8 #11
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O JSON da requisição é enviado ao servidor usando o encoding padrão ISO-8859-1 da classe StringEntity.
A RFC 8259 especifica que o encoding padrão do JSON é o UTF-8.
O resultado é que TTS com mensagens contendo caracteres especiais não são entregues como deveriam:
Nos endpoints legados apiX.totalvoice.com.br isso causa uma resposta 502 Bad Gateway do servidor.
No novo endpoint voice-api.zenvia.com as chamadas TTS são ditas com uma pausa na voz do bot onde deveria haver acentos.