diff --git a/package-lock.json b/package-lock.json
index d7812f3..6c80ed5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -351,6 +351,11 @@
       "integrity": "sha1-ojD2T1aDEOFJgAmUB5DsmVRbyn4=",
       "dev": true
     },
+    "data-uri-to-buffer": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmmirror.com/data-uri-to-buffer/download/data-uri-to-buffer-4.0.0.tgz",
+      "integrity": "sha1-tdtGrqUPYXZCisBbc745pXcBpks="
+    },
     "debug": {
       "version": "3.1.0",
       "resolved": "http://registry.npm.taobao.org/debug/download/debug-3.1.0.tgz",
@@ -411,14 +416,6 @@
       "resolved": "http://registry.npm.taobao.org/ee-first/download/ee-first-1.1.1.tgz",
       "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
     },
-    "encoding": {
-      "version": "0.1.12",
-      "resolved": "http://registry.npm.taobao.org/encoding/download/encoding-0.1.12.tgz",
-      "integrity": "sha1-U4tm8+5izRq1HsMjgp0flIDHS+s=",
-      "requires": {
-        "iconv-lite": "0.4.19"
-      }
-    },
     "error-inject": {
       "version": "1.0.0",
       "resolved": "http://registry.npm.taobao.org/error-inject/download/error-inject-1.0.0.tgz",
@@ -498,6 +495,15 @@
         "is-extglob": "1.0.0"
       }
     },
+    "fetch-blob": {
+      "version": "3.1.4",
+      "resolved": "https://registry.npmmirror.com/fetch-blob/download/fetch-blob-3.1.4.tgz",
+      "integrity": "sha512-Eq5Xv5+VlSrYWEqKrusxY1C3Hm/hjeAsCGVG3ft7pZahlUAChpGZT/Ms1WmSLnEAisEXszjzu/s+ce6HZB2VHA==",
+      "requires": {
+        "node-domexception": "^1.0.0",
+        "web-streams-polyfill": "^3.0.3"
+      }
+    },
     "filename-regex": {
       "version": "2.0.1",
       "resolved": "http://registry.npm.taobao.org/filename-regex/download/filename-regex-2.0.1.tgz",
@@ -532,6 +538,14 @@
         "for-in": "1.0.2"
       }
     },
+    "formdata-polyfill": {
+      "version": "4.0.10",
+      "resolved": "https://registry.npmmirror.com/formdata-polyfill/download/formdata-polyfill-4.0.10.tgz",
+      "integrity": "sha1-JIB8McnUAuACqz2McgFEzriEhCM=",
+      "requires": {
+        "fetch-blob": "^3.1.2"
+      }
+    },
     "fresh": {
       "version": "0.5.2",
       "resolved": "http://registry.npm.taobao.org/fresh/download/fresh-0.5.2.tgz",
@@ -573,7 +587,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.1.1",
@@ -624,7 +639,8 @@
         "balanced-match": {
           "version": "0.4.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "bcrypt-pbkdf": {
           "version": "1.0.1",
@@ -639,6 +655,7 @@
           "version": "0.0.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "inherits": "2.0.3"
           }
@@ -647,6 +664,7 @@
           "version": "2.10.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "hoek": "2.16.3"
           }
@@ -655,6 +673,7 @@
           "version": "1.1.7",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "0.4.2",
             "concat-map": "0.0.1"
@@ -663,7 +682,8 @@
         "buffer-shims": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "caseless": {
           "version": "0.12.0",
@@ -680,12 +700,14 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "combined-stream": {
           "version": "1.0.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "delayed-stream": "1.0.0"
           }
@@ -693,17 +715,20 @@
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "cryptiles": {
           "version": "2.0.5",
@@ -749,7 +774,8 @@
         "delayed-stream": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "delegates": {
           "version": "1.0.0",
@@ -775,7 +801,8 @@
         "extsprintf": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "forever-agent": {
           "version": "0.6.1",
@@ -797,12 +824,14 @@
         "fs.realpath": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "fstream": {
           "version": "1.0.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "graceful-fs": "4.1.11",
             "inherits": "2.0.3",
@@ -858,6 +887,7 @@
           "version": "7.1.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "fs.realpath": "1.0.0",
             "inflight": "1.0.6",
@@ -870,7 +900,8 @@
         "graceful-fs": {
           "version": "4.1.11",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "har-schema": {
           "version": "1.0.5",
@@ -909,7 +940,8 @@
         "hoek": {
           "version": "2.16.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "http-signature": {
           "version": "1.1.1",
@@ -926,6 +958,7 @@
           "version": "1.0.6",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "once": "1.4.0",
             "wrappy": "1.0.2"
@@ -934,7 +967,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.4",
@@ -946,6 +980,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "1.0.1"
           }
@@ -959,7 +994,8 @@
         "isarray": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "isstream": {
           "version": "0.1.2",
@@ -1032,12 +1068,14 @@
         "mime-db": {
           "version": "1.27.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "mime-types": {
           "version": "2.1.15",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "mime-db": "1.27.0"
           }
@@ -1046,6 +1084,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "1.1.7"
           }
@@ -1053,12 +1092,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -1111,7 +1152,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "oauth-sign": {
           "version": "0.8.2",
@@ -1129,6 +1171,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1.0.2"
           }
@@ -1158,7 +1201,8 @@
         "path-is-absolute": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "performance-now": {
           "version": "0.2.0",
@@ -1169,7 +1213,8 @@
         "process-nextick-args": {
           "version": "1.0.7",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "punycode": {
           "version": "1.4.1",
@@ -1207,6 +1252,7 @@
           "version": "2.2.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "buffer-shims": "1.0.0",
             "core-util-is": "1.0.2",
@@ -1251,6 +1297,7 @@
           "version": "2.6.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "glob": "7.1.2"
           }
@@ -1258,7 +1305,8 @@
         "safe-buffer": {
           "version": "5.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "semver": {
           "version": "5.3.0",
@@ -1312,24 +1360,26 @@
             }
           }
         },
-        "string_decoder": {
-          "version": "1.0.1",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "safe-buffer": "5.0.1"
-          }
-        },
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "1.1.0",
             "is-fullwidth-code-point": "1.0.0",
             "strip-ansi": "3.0.1"
           }
         },
+        "string_decoder": {
+          "version": "1.0.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "safe-buffer": "5.0.1"
+          }
+        },
         "stringstream": {
           "version": "0.0.5",
           "bundled": true,
@@ -1340,6 +1390,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "2.1.1"
           }
@@ -1354,6 +1405,7 @@
           "version": "2.2.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "block-stream": "0.0.9",
             "fstream": "1.0.11",
@@ -1409,7 +1461,8 @@
         "util-deprecate": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "uuid": {
           "version": "3.0.1",
@@ -1438,7 +1491,8 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -1684,7 +1738,8 @@
     "is-stream": {
       "version": "1.1.0",
       "resolved": "http://registry.npm.taobao.org/is-stream/download/is-stream-1.1.0.tgz",
-      "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ="
+      "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ=",
+      "dev": true
     },
     "is-windows": {
       "version": "1.0.1",
@@ -2093,13 +2148,19 @@
       "resolved": "http://registry.npm.taobao.org/negotiator/download/negotiator-0.6.1.tgz",
       "integrity": "sha1-KzJxhOiZIQEXeyhWP7XnECrNDKk="
     },
+    "node-domexception": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmmirror.com/node-domexception/download/node-domexception-1.0.0.tgz",
+      "integrity": "sha1-aIjbRqH3HAt2s/dVUBa2P+ZHZuU="
+    },
     "node-fetch": {
-      "version": "1.7.3",
-      "resolved": "http://registry.npm.taobao.org/node-fetch/download/node-fetch-1.7.3.tgz",
-      "integrity": "sha1-mA9vcthSEaU0fGsrwYxbhMPrR+8=",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmmirror.com/node-fetch/download/node-fetch-3.1.1.tgz",
+      "integrity": "sha512-SMk+vKgU77PYotRdWzqZGTZeuFKlsJ0hu4KPviQKkfY+N3vn2MIzr0rvpnYpR8MtB3IEuhlEcuOLbGvLRlA+yg==",
       "requires": {
-        "encoding": "0.1.12",
-        "is-stream": "1.1.0"
+        "data-uri-to-buffer": "^4.0.0",
+        "fetch-blob": "^3.1.3",
+        "formdata-polyfill": "^4.0.10"
       }
     },
     "nodemon": {
@@ -2546,15 +2607,6 @@
         "duplexer": "0.1.1"
       }
     },
-    "string_decoder": {
-      "version": "1.0.3",
-      "resolved": "http://registry.npm.taobao.org/string_decoder/download/string_decoder-1.0.3.tgz",
-      "integrity": "sha1-D8Z9fBQYJd6UKC3VNr7GubzoYKs=",
-      "dev": true,
-      "requires": {
-        "safe-buffer": "5.1.1"
-      }
-    },
     "string-width": {
       "version": "2.1.1",
       "resolved": "http://registry.npm.taobao.org/string-width/download/string-width-2.1.1.tgz",
@@ -2565,6 +2617,15 @@
         "strip-ansi": "4.0.0"
       }
     },
+    "string_decoder": {
+      "version": "1.0.3",
+      "resolved": "http://registry.npm.taobao.org/string_decoder/download/string_decoder-1.0.3.tgz",
+      "integrity": "sha1-D8Z9fBQYJd6UKC3VNr7GubzoYKs=",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
     "strip-ansi": {
       "version": "4.0.0",
       "resolved": "http://registry.npm.taobao.org/strip-ansi/download/strip-ansi-4.0.0.tgz",
@@ -2712,6 +2773,11 @@
       "resolved": "http://registry.npm.taobao.org/vary/download/vary-1.1.2.tgz",
       "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
     },
+    "web-streams-polyfill": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmmirror.com/web-streams-polyfill/download/web-streams-polyfill-3.2.0.tgz",
+      "integrity": "sha1-prdAJrOOSIWGn7XFiekLlcz8eWU="
+    },
     "which": {
       "version": "1.3.0",
       "resolved": "http://registry.npm.taobao.org/which/download/which-1.3.0.tgz",
diff --git a/package.json b/package.json
index d255420..3f57011 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "koa-cors": "0.0.16",
     "koa-router": "^7.2.1",
     "koa-static-server": "^1.3.2",
-    "node-fetch": "^1.7.3"
+    "node-fetch": "^3.1.1"
   },
   "devDependencies": {
     "cross-env": "^5.0.5",