Webservice调用给出错误。反应性地

Question

我这样调用网络服务：

fetch('url', {
            method: 'POST',
            headers: new Headers({
                          Accept: 'application/json',
                        'Content-Type': 'application/json', // <-- Specifying the Content-Type
                }),
            })
            .then((response) =>  response.text())
            .then(leaders => {
              console.log("leader = ", leaders);
}

但是这给了我这样的错误：

Server was unable to process request. ---> Data at the root level is invalid. Line 1, position 1.

Answer 1

尝试以下代码：

  fetch('url', {
                method: 'POST',
      headers: {
        Accept: 'application/json',
        'Content-Type': 'application/json',
      },
                body: JSON.stringify(collection) // <-- Post parameters
                })
                .then((response) =>  response.text())
                .then(leaders => {
                  console.log("leader = ", leaders);
    }

或者您可以直接致电：

   fetch(url)
      .then(response => response.json())
      .then(data => this.setState({ data }));