我正在尝试使用Mendeley API下载附加到资源（文档）的文件。我在这里关注开发者文档：看https://dev.mendeley.com/methods/#downloading-a-file起来它应该是相当直接的。我已经弄清楚了Oauth流程，我能够拉到我所有的文件从Mendeley图书馆。我也能够获得给定文档的附加文件id。
当我试图使用该ID检索文件（在本例中是PDF）时，它失败了。我已经将参数复制到postman，它在那里运行得很好，但是当我尝试在我的Ruby-on-rails应用程序中使用JavaScript时，它失败了。
我是JavaScript的新手，所以我很可能错过了一些明显的东西。
下面是JavaScript代码片段：

downloadFile = (json) => {
        this.getAuthCode();
        this.provideToken = (token) => {
            const access_token = token;
            var myHeaders = new Headers();
            myHeaders.append("Authorization", `Bearer ${access_token}`);
            var requestOptions = {
                method: 'GET',
                headers: myHeaders,
            };
            fetch(`https://api.mendeley.com/files/${json[0].id}`, requestOptions).then(resp => {
                console.log(resp)
            })
        }
    }

字符串
JSON参数是与文档关联的文件数组。它似乎工作正常，直到Mendeley服务器重定向到有问题文件的AWS S3存储URL。以下是Chrome开发者控制台的输出：

Response {type: "cors", url: "https://mendeley-files.s3.amazonaws.com/31/9f/319f…09d6b8443d1e734fad70c551e37a0a3497b42c69fd0796c91", redirected: true, status: 400, ok: false, …}
body: (...)
bodyUsed: false
headers: Headers
__proto__: Headers
ok: false
redirected: true
status: 400
statusText: "Bad Request"
type: "cors"
url: "https://mendeley-files.s3.amazonaws.com/31/9f/319fe16b678cc65092ef5aa732b3e4c137f272f3?response-content-disposition=attachment%3Bfilename%3D%222003-Psychometric_properties_of_student_ratings_of_instruction_in_online_and_on-campus_courses.pdf%22&response-content-type=application%2Fpdf&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEOz%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJIMEYCIQCP0qEL1EJeGKIBVmxX2FaPIZftcmqiW%2FzgDY5ysRs25AIhAMM6q3YzWSubSnuuXOs9gi8voOZ%2BRrkQS343IkihJka1KvYDCDUQAhoMMTA4MTY2MTk0NTA1Igx2zsOuUuv1h6V8cw0q0wMNdVy5izfbA30MysjiNXG3V%2F21aHfn2xXF8ZKq74%2FAbDUbTzKfFWuN79ARNbEyeGinrXdlRXb%2FlEP9ZRgb6xh1%2BtCBtpqT8esZmdZcERC%2Fpup8dtd8q%2BWeCxVKVIyYZffZJvJW1wQOONhMJnfpb751Lr1pTN%2BAu38q8Dky8sOB%2B%2FyH0xOXbP5S0IFErM0B1Ac7eJLOTLrrzwuQ17Z1ZF%2FN5ZenKtV5rrIRR8RU0%2FnzY6EQip1LIHy7l%2F0rN9srGyM1n3fT5trqKL7H6mi79ZlbN0RJ%2FZAtO6pWTL6DbpFzrlCTt6fI%2B2UqdEDrVBO4QT8ROYnd8dYd%2F3hrB1%2BOjuugRDRE6tUehgn9lnFWUndww0XHOWUq8GWAOImeBts7fazUmcCv8lzhH09FYwbcaOKghr6HhJko5UUpeGV4TjMVCA1wUZ4G3DBBVTUIKBLbve0oWFexVFj2J380neGXywdPbEzUcp5o6N%2FEGOW5nMJHlwIquMDubiwgrQ5ANES6RhuO%2BBQTHuy9JdL2KrfhEHA3UJBm6T4Azg1XgEIpXo84Hs7cc2x7ewZ6CPUyzXcc%2Bx72u1o6RwoE12AKdp%2BwqZK4NnFmn6jXKKCSShgmVuqUr3ARVTDmy%2Bb1BTruAQmSrzEXqXzi5Ut4AWjWCEMvw4mB5Yk8W6v5V6YTRtwp8ebqI9Q4hzfMT62ko1AQsBwhKX8anZTIvDVpImcjbUQnaWVGKehj0OGVOb%2FnCn3JXZRq2bCKfQ2Mf7YxlWSHIy9CWqZiW4uTpdSfk5kOOnYQhrKhHQJc%2BM%2F7BldOy72AVgikcmvQdR3k315KNwh%2BJ96ci4LvRa%2BiXw5stATLCQCSKWPYCRonCighfGxNoAyWvvuTkjaQe3bm6X64Giwm2qyyAso05hnC3gotbefpEFNjx2%2Brgm2G%2FzNwdKkr2I%2BFy%2BnGXVNNG2ruh2DMVOw%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20200511T205618Z&X-Amz-SignedHeaders=host&X-Amz-Expires=600&X-Amz-Credential=ASIARSLZVEVE5V2CTSJF%2F20200511%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=96b2a6673ab742909d6b8443d1e734fad70c551e37a0a3497b42c69fd0796c91"
__proto__: Response
arrayBuffer: ƒ arrayBuffer()
blob: ƒ blob()
body: (...)
bodyUsed: (...)
clone: ƒ clone()
formData: ƒ formData()
headers: (...)
json: ƒ json()
ok: (...)
redirected: (...)
status: (...)
statusText: (...)
text: ƒ text()
type: (...)
url: (...)
constructor: ƒ Response()
Symbol(Symbol.toStringTag): "Response"
get body: ƒ body()
get bodyUsed: ƒ bodyUsed()
get headers: ƒ headers()
get ok: ƒ ok()
get redirected: ƒ redirected()
get status: ƒ status()
get statusText: ƒ statusText()
get type: ƒ type()
get url: ƒ url()
__proto__: Object

型
它显然找到了正确的文件，但无法下载。当我在Postman中运行它时，它会下载文件。
我试过添加各种标题，显示在 Postman 作为'隐藏'，但我得到基本相同的React。对此有任何想法或方向将不胜感激。