Java 将特定图像转换为base64字符串不正确

我正在尝试使用以下代码将图像转换为base64字符串

public String base64Concert() throws Exception {
    String imageUrl = "https://www.anyhost.org/image/ThisGateway/ThisGatewayImage?imageName=IMG2975576618502471333.PNG";

    String getEncodedString = getBase64String(imageUrl);

    System.out.println("encoded String: " + getEncodedString);


}


// Image conversion

public String getBase64String(String imageUrl) throws Exception {
    byte[] imageBytes = IOUtils.toByteArray(new URL(imageUrl));
    String encodedString = DatatypeConverter.printBase64Binary(imageBytes);

    return encodedString;

}

这适用于任何其他图像，例如，我将获得正确的base64字符串，我可以在html中使用它：

<div>
<p>This is a test</p>
<img src="data:image/png;base64, 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"/>

这是一个测试

但是对于这个我想要转换的特定图像，我得到了一个奇怪的base64编码结果，当我把它放在Html中时，它不会显示出来

<div>
<p>This is a test</p>
<img src="data:image/png;base64, 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这是一个测试

我用这个在线工具生成的代码验证了我从Java代码中得到的结果，结果不一样。当我将工具放入html时，它的结果确实起作用

不幸的是，我使用的图像是由证书保护的，因此我将无法共享该URL。

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该文件大约为16MB，但我不确定大小是否是问题所在。还有什么我可以尝试的吗？

看起来我是在使用Resttemplate进行初始调用，以获取响应中的图像URL。我在这个resttemplate调用中包括了.pfx证书。但是，当我使用new URL（）进行第二次调用时，我没有包含证书，并且我正在检索一个我编码的失败html响应