Add proxy CLI variable (#710)

Author: oldbig

README.md

@@ -73,10 +73,37 @@ Then you can run the following commands:
 
     Usage:
 
-      web-push send-notification --endpoint=<url> [--key=<browser key>] [--auth=<auth secret>] [--payload=<message>] [--encoding=<aesgcm | aes128gcm>] [--ttl=<seconds>] [--vapid-subject=<vapid subject>] [--vapid-pubkey=<public key url base64>] [--vapid-pvtkey=<private key url base64>] [--gcm-api-key=<api key>]
+      web-push send-notification --endpoint=<url> [--key=<browser key>] [--auth=<auth secret>] [--payload=<message>] [--encoding=<aesgcm | aes128gcm>] [--ttl=<seconds>] [--vapid-subject=<vapid subject>] [--vapid-pubkey=<public key url base64>] [--vapid-pvtkey=<private key url base64>] [--proxy=<http proxy uri>] [--gcm-api-key=<api key>]
 
       web-push generate-vapid-keys [--json]
 
+  Example of send notification:
+  ```shell
+    > web-push generate-vapid-keys --json
+    > {"publicKey":"BGtkbcjrO12YMoDuq2sCQeHlu47uPx3SHTgFKZFYiBW8Qr0D9vgyZSZPdw6_4ZFEI9Snk1VEAj2qTYI1I1YxBXE","privateKey":"I0_d0vnesxbBSUmlDdOKibGo6vEXRO-Vu88QlSlm5j0"}
+  ```
+   The subscription value:
+  ```javascript
+    { 
+      "endpoint": "https://fcm.googleapis.com/fcm/send/d61c5u920dw:APA91bEmnw8utjDYCqSRplFMVCzQMg9e5XxpYajvh37mv2QIlISdasBFLbFca9ZZ4Uqcya0ck-SP84YJUEnWsVr3mwYfaDB7vGtsDQuEpfDdcIqOX_wrCRkBW2NDWRZ9qUz9hSgtI3sY", 
+      "expirationTime": null, 
+      "keys": { 
+        "p256dh": "BL7ELU24fJTAlH5Kyl8N6BDCac8u8li_U5PIwG963MOvdYs9s7LSzj8x_7v7RFdLZ9Eap50PiiyF5K0TDAis7t0", 
+        "auth": "juarI8x__VnHvsOgfeAPHg" 
+      } 
+    }
+  ```
+  The command example:
+  ```shell
+    web-push send-notification  \
+    --endpoint=https://fcm.googleapis.com/fcm/send/d61c5u920dw:APA91bEmnw8utjDYCqSRplFMVCzQMg9e5XxpYajvh37mv2QIlISdasBFLbFca9ZZ4Uqcya0ck-SP84YJUEnWsVr3mwYfaDB7vGtsDQuEpfDdcIqOX_wrCRkBW2NDWRZ9qUz9hSgtI3sY \
+    --key=BL7ELU24fJTAlH5Kyl8N6BDCac8u8li_U5PIwG963MOvdYs9s7LSzj8x_7v7RFdLZ9Eap50PiiyF5K0TDAis7t0 \
+    --auth=juarI8x__VnHvsOgfeAPHg \
+    --vapid-subject=mailto:example@qq.com \
+    --vapid-pubkey=BGtkbcjrO12YMoDuq2sCQeHlu47uPx3SHTgFKZFYiBW8Qr0D9vgyZSZPdw6_4ZFEI9Snk1VEAj2qTYI1I1YxBXE \
+    --vapid-pvtkey=I0_d0vnesxbBSUmlDdOKibGo6vEXRO-Vu88QlSlm5j0 \
+    --payload=Hello
+  ```  
 
 # API Reference
 

src/cli.js

@@ -19,6 +19,7 @@ const printUsageDetails = () => {
         '[--vapid-subject=<vapid subject>]',
         '[--vapid-pubkey=<public key url base64>]',
         '[--vapid-pvtkey=<private key url base64>]',
+        '[--proxy=<http proxy uri, e.g: http://127.0.0.1:8889>]',
         '[--gcm-api-key=<api key>]'
       ]
     }, {
@@ -87,6 +88,10 @@ const sendNotification = args => {
     };
   }
 
+  if (args.proxy) {
+    options.proxy = args.proxy;
+  }
+
   if (args['gcm-api-key']) {
     options.gcmAPIKey = args['gcm-api-key'];
   }