Added test for converting the data uri to a Blob;

Fixed bug with parsing mime type for Blob;

lib/helpers/fromDataURI.js

@@ -23,7 +23,7 @@ module.exports = function fromDataURI(uri, asBlob, options) {
   }
 
   if (protocol === 'data') {
-    uri = uri.slice(protocol.length);
+    uri = protocol.length ? uri.slice(protocol.length + 1) : uri;
 
     var match = DATA_URL_PATTERN.exec(uri);
 

test/unit/adapters/http.js

@@ -15,6 +15,7 @@ var formidable = require('formidable');
 var express = require('express');
 var multer = require('multer');
 var bodyParser = require('body-parser');
+const isBlobSupported = typeof Blob !== 'undefined';
 
 var noop = ()=> {};
 
@@ -1483,6 +1484,24 @@ describe('supports http with nodejs', function () {
       }).catch(done);
     });
 
+    it('should support requesting data URL as a Blob (if supported by the environment)', function (done) {
+
+      if (!isBlobSupported) {
+        this.skip();
+        return;
+      }
+
+      const buffer = Buffer.from('123');
+
+      const dataURI = 'data:application/octet-stream;base64,' + buffer.toString('base64');
+
+      axios.get(dataURI, {responseType: 'blob'}).then(async ({data})=> {
+        assert.strictEqual(data.type, 'application/octet-stream');
+        assert.deepStrictEqual(await data.text(), '123');
+        done();
+      }).catch(done);
+    });
+
     it('should support requesting data URL as a String (text)', function (done) {
       const buffer = Buffer.from('123', 'utf-8');
 

test/unit/helpers/fromDataURI.js

@@ -7,6 +7,6 @@ describe('helpers::fromDataURI', function () {
 
     const dataURI = 'data:application/octet-stream;base64,' + buffer.toString('base64');
 
-    assert.deepStrictEqual(fromDataURI(dataURI), buffer);
+    assert.deepStrictEqual(fromDataURI(dataURI, false), buffer);
   });
 });