[SalesForce] Converting from cURL to Http request Method in Salesforce

Kindly suggest me where I'm I going wrong, It works perfectly fine in cURL but when i try doing in in salesforce I'm facing all these Issues

This is My cURL

curl -H "Authorization:Bearer 7512d7f8-2706-4dcd-a288-af482fb728ca" -H "Content-Type: application/json" -d '{"filter" :{}}' https://sandbox-api.flipkart.net/sellers/orders/search

Equivalent Http method

My Access Token : 7512d7f8-2706-4dcd-a288-af482fb728ca

public static void new_version(){

        string tok = 'https://sandbox-api.flipkart.net/sellers/orders/search';
        HttpRequest req = new HttpRequest();
        req.setMethod('POST');
        req.setTimeout(60*1000);        
        req.setEndpoint(tok);

        Blob headerValue = Blob.valueOf('7512d7f8-2706-4dcd-a288-af482fb728ca');
        String authorizationHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue);
        req.setHeader('Authorization' + 'Bearer', authorizationHeader);
        req.setHeader('Content-Type', 'application/json');
        system.debug('@@@@@@@'+req);

        Http h = new Http();
        String resp;
        HttpResponse res = h.send(req);
        resp = res.getBody();        
        system.debug('@@@@@@@@@@'+res);

    }

Error Which I'm facing 

System.HttpResponse[Status=Unauthorized, StatusCode=401]

Best Answer

Your Apex is combining Basic Auth and OAuth, you are confusing yourself... that approach won't work. The OAuth dance is NOT the same thing as Basic Authentication.

This is "basic-auth-ish" and won't work with OAuth bearer token. You don't need either of these lines:

Blob headerValue = Blob.valueOf('7512d7f8-2706-4dcd-a288-af482fb728ca');
String authorizationHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue);

... and since your curl script is clearly OAUth, the equivalent Apex header is:

req.setHeader('Authorization', 'Bearer 7512d7f8-2706-4dcd-a288-af482fb728ca');

Make sure to include the space after the word Bearer.

To recap: remove the 2 lines and make sure your 'Authorization' header is as shown above.

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