地址：https://github.com/Chanzhaoyu/chatgpt-web/blob/main/src/views/chat/index.vue

  try {
    let lastText = ''
    const fetchChatAPIOnce = async () => {
      await fetchChatAPIProcess<Chat.ConversationResponse>({
        prompt: message,
        options,
        signal: controller.signal,
        onDownloadProgress: ({ event }) => {
          const xhr = event.target
          const { responseText } = xhr
          // Always process the final line
          const lastIndex = responseText.lastIndexOf('\n', responseText.length - 2)
          let chunk = responseText
          if (lastIndex !== -1)
            chunk = responseText.substring(lastIndex)
          try {
            const data = JSON.parse(chunk)
            updateChat(
              +uuid,
              dataSources.value.length - 1,
              {
                dateTime: new Date().toLocaleString(),
                text: lastText + (data.text ?? ''),
                inversion: false,
                error: false,
                loading: true,
                conversationOptions: { conversationId: data.conversationId, parentMessageId: data.id },
                requestOptions: { prompt: message, options: { ...options } },
              },
            )

            if (openLongReply && data.detail.choices[0].finish_reason === 'length') {
              options.parentMessageId = data.id
              lastText = data.text
              message = ''
              return fetchChatAPIOnce()
            }

            scrollToBottomIfAtBottom()
          }
          catch (error) {
            //
          }
        },
      })
      updateChatSome(+uuid, dataSources.value.length - 1, { loading: false })
    }

    await fetchChatAPIOnce()
  }
  catch (error: any) {
    const errorMessage = error?.message ?? t('common.wrong')

    if (error.message === 'canceled') {
      updateChatSome(
        +uuid,
        dataSources.value.length - 1,
        {
          loading: false,
        },
      )
      scrollToBottomIfAtBottom()
      return
    }

    const currentChat = getChatByUuidAndIndex(+uuid, dataSources.value.length - 1)

    if (currentChat?.text && currentChat.text !== '') {
      updateChatSome(
        +uuid,
        dataSources.value.length - 1,
        {
          text: `${currentChat.text}\n[${errorMessage}]`,
          error: false,
          loading: false,
        },
      )
      return
    }

    updateChat(
      +uuid,
      dataSources.value.length - 1,
      {
        dateTime: new Date().toLocaleString(),
        text: errorMessage,
        inversion: false,
        error: true,
        loading: false,
        conversationOptions: null,
        requestOptions: { prompt: message, options: { ...options } },
      },
    )
    scrollToBottomIfAtBottom()
  }
  finally {
    loading.value = false
  }
}