HTTP API Path contain Chinese response 409 path not found?

If you're sending the same value as the SDK, please double check that you're connected to the same account/app. It's possible you're using an access token for a different account/app that in fact doesn't have anything at that path.

Otherwise, please share the full code we can use to reproduce the issue.

Account/app is correct, In the same folder for my test,i create two folders one path contains Chinese,one just pure English letters,the later folder test success,so the Account/APP is not the problem.

Here is the code https://gist.github.com/user20161119/84681489c04ef912d3646ab6ef05c357

Actually,just try to use httpclient to send the http request to dropbox api,will get the same result as mine.thanks

Here is my code snippet,https://gist.github.com/user20161119/84681489c04ef912d3646ab6ef05c357

Actually,just try to use java httpclient to send to https://www.dropbox.com/developers/documentation/http/documentation#files-get_preview endpoint,will reproduce my issue,thanks

Your code sample uses some custom classes so I can't run it, but this runs fine for me:

 

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class Main {

    public static void main(String[] args) throws IOException {

        String ACCESS_TOKEN = "<ACCESS_TOKEN>";
        String filePath = "/blackdog/中文prd.docx";

        JsonFactory jsonFactory = new JsonFactory();
        OutputStream outputStream = new ByteArrayOutputStream();
        JsonGenerator jsonGenerator = jsonFactory.createGenerator(outputStream);
        jsonGenerator.setHighestNonEscapedChar(0x7E);
        jsonGenerator.writeStartObject();
        jsonGenerator.writeStringField("path", filePath);
        jsonGenerator.writeEndObject();
        jsonGenerator.close();

        String arg = outputStream.toString();
        System.out.println(arg);

        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            HttpPost httpost = new HttpPost("https://content.dropboxapi.com/2/files/get_preview");
            httpost.setHeader("Authorization", "Bearer " + ACCESS_TOKEN);
            httpost.setHeader("Dropbox-API-Arg", arg);

            ResponseHandler<String> responseHandler = new ResponseHandler<String>() {

                @Override
                public String handleResponse(final HttpResponse response) throws IOException {
                    int status = response.getStatusLine().getStatusCode();
                    System.out.println(status);
                    HttpEntity entity = response.getEntity();
                    return entity != null ? EntityUtils.toString(entity) : null;
                }
            };

            String responseBody = httpclient.execute(httpost, responseHandler);
            System.out.println(responseBody);

        } finally {
            httpclient.close();
        }

    }
}

That outputs:

{"path":"/blackdog/\u4E2D\u6587prd.docx"}
200
%PDF-1.4
%Ç쏢
<more PDF content truncated for brevity>

thanks,

from your code, the difference is the following snippet i use Jackson ObjectMapper in my app,i will try your code later.

JsonFactory jsonFactory = new JsonFactory();
        OutputStream outputStream = new ByteArrayOutputStream();
        JsonGenerator jsonGenerator = jsonFactory.createGenerator(outputStream);
        jsonGenerator.setHighestNonEscapedChar(0x7E);
        jsonGenerator.writeStartObject();
        jsonGenerator.writeStringField("path", filePath);
        jsonGenerator.writeEndObject();
        jsonGenerator.close();

I tried use the following code to generate the Dropbox-API-Arg header value,and work correctly

 DropboxContentReq req = new DropboxContentReq(DropboxAPI.PREVIEW);
 req.setHttp_method(HttpMethod.POST);
 String filePath = "/blackdog/中文prd.docx";
 
 JsonFactory jsonFactory = new JsonFactory();
 OutputStream outputStream = new ByteArrayOutputStream();
 JsonGenerator jsonGenerator = jsonFactory.createGenerator(outputStream);
 jsonGenerator.setHighestNonEscapedChar(0x7E);
 jsonGenerator.writeStartObject();
 jsonGenerator.writeStringField("path", filePath);
 jsonGenerator.writeEndObject();
 jsonGenerator.close();

 String arg = outputStream.toString();
 System.out.println(arg);

 
 DropboxPathReq _req = new DropboxPathReq();
 //convert Chinese to Unicode /blackdog/\\u4E2D\\u6587prd.docx
 filePath = StringEscapeUtils.escapeJava(filePath);
 _req.setPath(filePath);
 //concat the json work 
 String json_header = "{\"path\":\"" + filePath + "\"}";
 
 //use arg as header value work correct
 //req.getHeaders().add("Dropbox-API-Arg",json_header);

 req.getHeaders().add("Dropbox-API-Arg",json_header);

 String json = dropbox_api_service.callDropbox(req);
 LoggerUtils.logInfo(this.getClass(), json);
 

 and i concat the Dropbox-API-Arg header json value,work correctly too,

 String json_header = "{\"path\":\"" + filePath + "\"}";

 I use Jackson ObjectMapper generate the header value before,the difference is 

{"path":"/blackdog/\\u4E2D\\u6587prd.docx"}

 there are two \ in the json string,maybe is violate the HTTP HEADER spec,i will check http header value spec later,any way thanks for your time.