好，我找到了答案. 我的响应对象中的设置很好，我只需要手动更改

well, I found the answer. The settings in my response object are fine, I just had to manually change the settings in API Gateway for this to work in the browser. I have added "*/*" to binary media types under the binary settings in API Gateway console

API网关

1. 只需登录您的控制台
2. 选择您的api
3. 单击下拉列表中的二进制支持
4. 编辑二进制媒体类型并添加"*/*"

前锋

在新标签页中打开api网址(target ="_ blank").可能是浏览器正在处理已编码的base 64响应，就我而言，对于chrome，浏览器只是在新标签页中打开pdf文件，就像我想要的那样.

opening the api url in new tab (target="_blank"). Probably the browser is handling the encoded base 64 response, In my case with chrome, the browser just opens the pdf in a new tab exactly like I want it to do.