String boundary = '-741d90e31frt';
    String header = '--'+boundary+'nContent-Disposition: form-data; name="pdfFile"; filename="'+Pdf_id+'.pdf";nContent-Type: application/octet-stream';
    String footer = '--'+boundary+'--';
    String headerEncoded = EncodingUtil.base64Encode(Blob.valueOf(header+'rnrn'));
    String bodyEncoded = EncodingUtil.base64Encode(pdf_Body);

     while(headerEncoded.endsWith('=')){
        header+=' ';
        headerEncoded = EncodingUtil.base64Encode(Blob.valueOf(header+'rnrn'));
    }

    Blob bodyBlob= null;
    String last4Bytes = bodyEncoded.substring(bodyEncoded.length()-4,bodyEncoded.length());
if(last4Bytes.endsWith('==')) {
        last4Bytes = last4Bytes.substring(0,2) + '0K';
        bodyEncoded = bodyEncoded.substring(0,bodyEncoded.length()-4) + last4Bytes;
        String footerEncoded = EncodingUtil.base64Encode(Blob.valueOf(footer));

       // bodyBlob = EncodingUtil.base64Decode(headerEncoded+bodyEncoded+headerEncoded1+bodyEncoded1+footerEncoded1);
    }
    else if(last4Bytes.endsWith('=')) {
        last4Bytes = last4Bytes.substring(0,3) + 'N';
        bodyEncoded = bodyEncoded.substring(0,bodyEncoded.length()-4) + last4Bytes;
        footer = 'n' + footer;
        String footerEncoded = EncodingUtil.base64Encode(Blob.valueOf(footer));

        //bodyBlob = EncodingUtil.base64Decode(headerEncoded+bodyEncoded+headerEncoded1+bodyEncoded1+footerEncoded1);
    }
    else if(last4Bytes.endsWith('9G')){
        system.debug('Entered in 9G');
        bodyEncoded = bodyEncoded +'Cg0K';
        String footerEncoded = EncodingUtil.base64Encode(Blob.valueOf(footer));

       // bodyBlob = EncodingUtil.base64Decode(headerEncoded+bodyEncoded+headerEncoded1+bodyEncoded1+footerEncoded1);
    }
    else {
        footer = 'rn' + footer;

        String footerEncoded = EncodingUtil.base64Encode(Blob.valueOf(footer));

       // bodyBlob = EncodingUtil.base64Decode(headerEncoded+bodyEncoded+headerEncoded1+bodyEncoded1+footerEncoded1);
    }


    String header1 = '--'+boundary+'nContent-Disposition: form-data; name="signFile"; filename="'+image_id+'";nContent-Type: application/octet-stream'; //octet-stream
    String footer1 = '--'+boundary+'--';
    String headerEncoded1 = EncodingUtil.base64Encode(Blob.valueOf(header1+'rnrn'));

    while(headerEncoded1.endsWith('=')){
        header1+=' ';
        headerEncoded1 = EncodingUtil.base64Encode(Blob.valueOf(header1+'rnrn'));
    }
    String bodyEncoded1 = EncodingUtil.base64Encode(image_Body);
    String last4Bytes1 = bodyEncoded1.substring(bodyEncoded1.length()-4,bodyEncoded1.length());
if(last4Bytes1.endsWith('==')) {
        last4Bytes1 = last4Bytes1.substring(0,2) + '0K';
        bodyEncoded1 = bodyEncoded1.substring(0,bodyEncoded1.length()-4) + last4Bytes1;
        String footerEncoded1 = EncodingUtil.base64Encode(Blob.valueOf(footer1));

       // bodyBlob = EncodingUtil.base64Decode(headerEncoded+bodyEncoded+headerEncoded1+bodyEncoded1+footerEncoded1);
    }
    else if(last4Bytes1.endsWith('=')) {
        last4Bytes1 = last4Bytes1.substring(0,3) + 'N';
        bodyEncoded1 = bodyEncoded1.substring(0,bodyEncoded1.length()-4) + last4Bytes1;
        footer1 = 'n' + footer1;
        String footerEncoded1 = EncodingUtil.base64Encode(Blob.valueOf(footer1));

        //bodyBlob = EncodingUtil.base64Decode(headerEncoded+bodyEncoded+headerEncoded1+bodyEncoded1+footerEncoded1);
    }
    else if(last4Bytes1.endsWith('9G')){
        system.debug('Entered in 9G');
        bodyEncoded1 = bodyEncoded1 +'Cg0K';
        String footerEncoded1 = EncodingUtil.base64Encode(Blob.valueOf(footer1));

       // bodyBlob = EncodingUtil.base64Decode(headerEncoded+bodyEncoded+headerEncoded1+bodyEncoded1+footerEncoded1);
    }
    else {
        footer1 = 'rn' + footer1;

        String footerEncoded1 = EncodingUtil.base64Encode(Blob.valueOf(footer1));

       // bodyBlob = EncodingUtil.base64Decode(headerEncoded+bodyEncoded+headerEncoded1+bodyEncoded1+footerEncoded1);
    }

    String footerEncoded1 = EncodingUtil.base64Encode(Blob.valueOf(footer1));



    bodyBlob = EncodingUtil.base64Decode(headerEncoded+bodyEncoded+headerEncoded1+bodyEncoded1+footerEncoded1);


        HttpRequest requ = new HttpRequest();
        requ.setHeader('Content-Type','multipart/form-data; boundary='+boundary);

        requ.setMethod('POST');
        requ.setEndpoint(pointer.endpoint_url__c+'/xxxxxxx/XXXXX/XXX/XX');

        String username = 'XXXXXX';
        String password = 'XXXXXX';

        Blob headerValue = Blob.valueOf(username + ':' + password);
        String authorizationHeader = 'Basic ' + EncodingUtil.base64Encode(headerValue);
        requ.setHeader('Authorization', authorizationHeader);

        requ.setBodyAsBlob(bodyBlob);
        requ.setTimeout(120000);

        Http http = new Http();
        HTTPResponse res = http.send(requ);