Google App Engine and Java SDK GetTemporaryLink Error

[Cross-linking for reference: https://github.com/dropbox/dropbox-sdk-java/issues/180 ]

 

It looks like you also posted this on GitHub. I answered there, but feel free to follow up in whichever location is more convenient for you.

I use Dropbox to save my application data, PDFs and ZIPs. To download my application data in Dropbox I use Temporary Link. The problem is I couldn't get the temporary link after >10 API request.

What error are you getting specifically? Please share the full output.

I couldn't get the error message, but based my condition checker code, It is look like output of the client.files().getTemporaryLink is "" (empty string) or null.

BTW, I use Java for my App and Dropbox-core-sdk (Java version)

I'm afraid I don't follow. The method would either return a result or raise an exception. Please double check the actual result.

Also, can you share the relevant code and steps to reproduce the issue?

This is my actual code.

public String unduhBerkas(String path)
            throws GetTemporaryLinkErrorException, DbxException{
       
        DbxRequestConfig config = DbxRequestConfig.newBuilder("My_App/1.0")
                 .withHttpRequestor(new GoogleAppEngineRequestor())
                 .withAutoRetryEnabled(100) // maksimal cobalagi jika gagal membuat request
                 .build();
       
        DbxClientV2 client = new DbxClientV2(config, ACCESS_TOKEN);

            GetTemporaryLinkResult temporaryLink = client.files().getTemporaryLink(path);
            this.link = temporaryLink.getLink();

            if (this.link.equals("")){
                Date date = new Date();
                // ambil 4 jam dari sekarang
                Date timeLinkExpiresAt  = addMinutesToDate(240, date);
                SharedLinkSettings sharedLinkSettings = SharedLinkSettings.newBuilder()
                        .withExpires(timeLinkExpiresAt)
                        .build();
                SharedLinkMetadata sharedLink = client.sharing().createSharedLinkWithSettings(path, sharedLinkSettings);
                this.link = sharedLink.getUrl();
                // ganti ujung URL dari dl=0 menjadi dl=1 agar bisa didownload
                if (this.link.endsWith("0")){
                    this.link = this.link.substring(0, this.link.length()-1) + "1";
                }
            }
        
        return link;
    }

I don't see any obvious issues with that. Can you add some logging or connect a debugger to check the actual return value from getTemporaryLink, or any raised exception?

This is the response I got, Another problem I found is response of API is inconsistent for same files (folders), Sometime I got 200, and sometimes 409 HTTPS Status Codes.

 

This is the screenshot of request timeline.

Dropbox API Error Logging

The 200 or 409 are just some possible status codes, and only indicate success/failure at a high level. The response body would contain more specific success or error information, but your screenshot doesn't include it unfortunately.

 

The SDK reads the response body and converts it to the native return type or exception, respectively, though. For example, if there is nothing found at the specific path, the response would be a 409 with some JSON indicating the issue in the response body, converted into a native exception by the SDK.

 

Please check what output or exception you're getting from the method. For instance, here's an example of handling a few different exceptions. The getTemporaryLink method throws GetTemporaryLinkErrorException.