Accented characters in file name

Question

I m using Dropbox V2 API  and when try to upload a file with name 'tête-à-tête' getting following error

Error in call to API function "files/upload_session/finish": HTTP header "Dropbox-API-Arg": could not decode input as JSON

Also if my folder name is 'tête-à-tête' then uploading any file inside it also goes to folder 't�te-�-t�te'.

In this case Accented character changed in header.

I m using .Net with C#

Please suggest.

Greg-DB · Accepted Answer

For these calls with the parameters in the header, you need to escape these characters. That is, when you use the “Dropbox-API-Arg” header, you need to make it “HTTP header safe”. This means using JSON-style “\uXXXX” escape codes for the character 0x7F and all non-ASCII characters.

Some, but not all, languages/libraries do this for you. For example, in C#, using Json.NET/JsonTextWriter, that would look like:

var sb = new StringBuilder();
var textWriter = new JsonTextWriter(new StringWriter(sb));
textWriter.StringEscapeHandling = StringEscapeHandling.EscapeNonAscii;

// Write things to text writer
textWriter.WriteStartArray();
textWriter.WriteValue("Hello");
...

var result = sb.toString().Replace("\x7f", "\u007f");

Or, using Json.NET/JsonConvert:

var serializerSettings = new JsonSerializerSettings();
serializerSettings.StringEscapeHandling = StringEscapeHandling.EscapeNonAscii;

var result = JsonConvert.SerializeObject(..., serializerSettings);
result = result.Replace("\x7f", "\u007f");