Accented characters in file name

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");