我试图测试salesforce的restapi callout，它通过apex代码进行oauth身份验证，并运行到下面的错误 Line: 12, Column: 1 System.UnexpectedException: java.lang.IllegalArgumentException: invalid start or end ```
public with sharing class RetrieveD365Data {
//@future (callout=true)
public void getD365Data() {
RetrieveAzureToken atz = new RetrieveAzureToken();
String bearer = atz.getAzureData();
Http http = new Http();
HttpRequest req1 = new HttpRequest();
req1.setEndpoint('https://dev-xyz.com/data/Customers');
req1.setMethod('GET');
req1.setHeader('Authorization','Bearer '+bearer);
HttpResponse res1 = http.send(req1); //Error is thrown in this line
System.debug('Response Body=========' + res1.getBody());
}
}

在哪里 `RetrieveAzureToken` 类如下所示，这与预期一样工作，我能够用承载令牌返回响应

global class RetrieveAzureToken {

private final String clientId = 'xxxxxxxxx';
private final String clientSecret = 'xxxxxxxxxx';

public String getAzureData()
{
    String reqbody = 'grant_type=client_credentials&client_id='+clientId+'&client_secret='+clientSecret;
    Http h = new Http();
    HttpRequest req = new HttpRequest();
    req.setBody(reqbody);
    req.setMethod('POST');
    req.setEndpoint('https://login.microsoftonline.com/tenant/oauth2/token');
    HttpResponse res = h.send(req);
    deserializeResponse resp1 = (deserializeResponse)JSON.deserialize(res.getbody(),deserializeResponse.class);
    system.debug('Token from Azure :' + resp1.access_token);  
    return  resp1.access_token;
}

public class deserializeResponse
{
    public String token_type;
    public String expires_in;
    public String ext_expires_in;
    public String expires_on;
    public String not_before;
    public String resource;
    public String access_token;
}

}

请让我想想我在这里错过了什么。