Response code 400: grant_type parameter is missing

EdDowgiallo — Wed, 03 Jun 2020 14:10:27 GMT

Plan: Premium

Country: USA

Device: Odroid H2

Operating System: Linux 19.10

My Question or Issue

I am working on a Java client. I have been able to access the whole API with no problem with the ironic exception of authorization. I would be quite happy if you could point me to any working Java example of getting the client_credentials token. The message I am currently getting and source code I am using are below:

Bad Request
400: Bad Request
{"error":"unsupported_grant_type","error_description":"grant_type parameter is missing"}
<<< Finished >>>

public static void main(final String[] args) {

getToken();

System.out.println("<<< Finished >>>");

}

private static final String CHARSET = "UTF-8";
private static final String GRANT_TYPE = "client_credentials";

public static String getToken() {

String PAYLOAD;
try {
// PAYLOAD = String.format("client_id=%s&client_secret=%s&grant_type=%s",
// URLEncoder.encode(CLIENT_ID, CHARSET),
// URLEncoder.encode(CLIENT_SECRET, CHARSET),
// URLEncoder.encode(GRANT_TYPE, CHARSET));
PAYLOAD = "grant_type=" + URLEncoder.encode("client_credentials", "UTF-8");
} catch (final UnsupportedEncodingException x) {
PAYLOAD = "";
x.printStackTrace();
}

String response = "";
try {
final URL url = new URL("https://accounts.spotify.com/api/token");
try {
final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestProperty("Accept", "application/json");
connection.setRequestProperty("grant_type", "client_credentials");
connection.setRequestProperty("Authorization", "Basic " + CLIENT_ID + ':' + CLIENT_SECRET);
connection.setRequestProperty("Content-Length", "" + PAYLOAD.length());
connection.setRequestMethod("POST");
connection.setDoInput(true);
connection.setDoOutput(true);

try (final DataOutputStream writer = new DataOutputStream(connection.getOutputStream())) {
writer.writeChars("PAYLOAD");
}

if (connection.getResponseCode() == 200) {
try (final BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
while (reader.ready()) {
System.out.println(reader.readLine());
}
}
} else {
System.out.println(connection.getResponseMessage());
try (final BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getErrorStream()))) {
while (reader.ready()) {
System.out.println(connection.getResponseCode() + ": " + connection.getResponseMessage());
System.out.println(reader.readLine());
}
}
}

} catch (final IOException x) {
x.printStackTrace();
}
} catch (final MalformedURLException x) {
x.printStackTrace();
}

return response;

}

Re: Response code 400: grant_type parameter is missing

Hubo — Mon, 08 Jun 2020 15:01:10 GMT

Hey @EdDowgiallo, I might be able to help here!

Hmm, I did some digging and I just wanted to check that the Authorization is passed in the Header of your request and that the grant_type is passed in the body of your POST request (encoded as application/x-www-form-urlencoded). Let me know if that helped here!

Have a good one,

Hubo

Re: Response code 400: grant_type parameter is missing

EdDowgiallo — Mon, 08 Jun 2020 22:01:13 GMT

Sorry Hubo, but that is the way it is currently encoded and it does not work.
Do you have any example code for Java? If we get this working I would be happy to provide you with sample Java code for the entire API.
Ed

Re: Response code 400: grant_type parameter is missing

EdDowgiallo — Sat, 20 Jun 2020 15:00:50 GMT

Is there any other information I can provide to help resolve this issue?

Re: Response code 400: grant_type parameter is missing

EdDowgiallo — Tue, 07 Jul 2020 00:26:41 GMT

Do you have a working example using Java? That would get me going.

topic Response code 400: grant_type parameter is missing in Spotify for Developers

Response code 400: grant_type parameter is missing

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Re: Response code 400: grant_type parameter is missing

Re: Response code 400: grant_type parameter is missing

Re: Response code 400: grant_type parameter is missing