使用“ heroku open”部署我的Node.js应用程序时出现“应用程序错误”

Question

我创建了一个项目，特别是使用Node.js的URL Shortener，它在端口本地运行时可以完美运行。 但是，在尝试使用heroku open命令通过Heroku推送它时，出现以下错误：

Application error
An error occurred in the application and your page could not be served. If you 
are the application owner, check your logs for details.

使用命令heroku logs检查heroku logs ，我得到了

2018-06-30T12:12:49.803878+00:00 heroku[web.1]: Error R10 (Boot timeout) -> 
Web process failed to bind to $PORT within 60 seconds of launch
2018-06-30T12:12:49.803878+00:00 heroku[web.1]: Stopping process with SIGKILL
2018-06-30T12:12:49.863059+00:00 heroku[web.1]: Process exited with status     
137
2018-06-30T12:12:49.917775+00:00 heroku[web.1]: State changed from starting 
to crashed
2018-06-30T12:12:50.752040+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=3c9d005b-1d44-4dd6-949f-e8569d11d6ce fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:12:53.135532+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=5831725a-1741-4de2-b584-1e93781acbb3 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:15:06.131305+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=52a81f50-a39a-447c-b5ff-6762306f6a30 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:15:07.638452+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=1442fbc5-b1c4-48d8-aaaa-b0d077a3c599 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:17:18.615544+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=e7174a54-81d7-41ad-be32-b24bdcc81058 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:17:20.204337+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=31beadca-550e-4465-9248-bbf249a3a3e5 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:19:59.481276+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=279bf7fa-620d-4f7f-a8df-1aed11b8e743 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:20:00.925705+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=f256ddc2-b25a-4e33-a286-e56ba883cdf0 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:22:32.739228+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=293c6632-7858-4cee-b027-bb9ac410dbf3 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:22:34.218261+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=d278275d-890a-4941-a7ad-1426d384369d fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:25:29.680329+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=c9c822d5-c0d0-4102-86f3-7cd25125056e fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:25:31.217264+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=797ff435-7bdb-4db7-83a7-8df3cf5c2c73 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:30:43.275158+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=988205da-18c6-4c0a-be94-74d3f0b9f580 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:30:44.718764+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=609ade39-ce5a-4099-bd7a-99ea7fe6acff fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:32:34.854123+00:00 heroku[web.1]: State changed from crashed to 
down
2018-06-30T12:32:34.732293+00:00 app[api]: Scaled to web@0:Free by user 
maan.vs97@gmail.com
2018-06-30T12:33:16.888301+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=3aa3ccc4-796d-4abb-bf21-85806f2f1419 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:33:18.353601+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=10fd0f3a-4301-405e-a0c9-ec64bcb5142d fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:33:49.923844+00:00 app[api]: Scaled to web@1:Free by user 
maan.vs97@gmail.com
2018-06-30T12:33:52.699604+00:00 heroku[web.1]: Starting process with command 
`node app.js`
2018-06-30T12:33:55.925804+00:00 app[web.1]: You are listening to port 3000
2018-06-30T12:33:55.980456+00:00 app[web.1]: (node:4) 
UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to 
server [localhost:27017] on first connect [MongoNetworkError: connect 
ECONNREFUSED 127.0.0.1:27017]
2018-06-30T12:33:55.980460+00:00 app[web.1]: at Pool.<anonymous> 
(/app/node_modules/mongodb-core/lib/topologies/server.js:505:11)
2018-06-30T12:33:55.980463+00:00 app[web.1]: at emitOne (events.js:116:13)
2018-06-30T12:33:55.980464+00:00 app[web.1]: at Pool.emit (events.js:211:7)
2018-06-30T12:33:55.980468+00:00 app[web.1]: at Object.onceWrapper 
(events.js:317:30)
2018-06-30T12:33:55.980466+00:00 app[web.1]: at Connection.<anonymous> 
(/app/node_modules/mongodb-core/lib/connection/pool.js:329:12)
2018-06-30T12:33:55.980469+00:00 app[web.1]: at emitTwo (events.js:126:13)
2018-06-30T12:33:55.980471+00:00 app[web.1]: at Connection.emit 
(events.js:214:7)
2018-06-30T12:33:55.980473+00:00 app[web.1]: at Socket.<anonymous> 
(/app/node_modules/mongodb-core/lib/connection/connection.js:245:50)
2018-06-30T12:33:55.980474+00:00 app[web.1]: at Object.onceWrapper 
(events.js:315:30)
2018-06-30T12:33:55.980476+00:00 app[web.1]: at emitOne (events.js:116:13)
2018-06-30T12:33:55.980477+00:00 app[web.1]: at Socket.emit (events.js:211:7)
2018-06-30T12:33:55.980480+00:00 app[web.1]: at emitErrorNT 
(internal/streams/destroy.js:64:8)
2018-06-30T12:33:55.980482+00:00 app[web.1]: at _combinedTickCallback 
(internal/process/next_tick.js:138:11)
2018-06-30T12:33:55.980483+00:00 app[web.1]: at process._tickCallback 
(internal/process/next_tick.js:180:9)
2018-06-30T12:33:55.981085+00:00 app[web.1]: (node:4) 
UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error 
originated either by throwing inside of an async function without a catch 
block, or by rejecting a promise which was not handled with .catch(). 
(rejection id: 1)
2018-06-30T12:33:55.981260+00:00 app[web.1]: (node:4) [DEP0018] 
DeprecationWarning: Unhandled promise rejections are deprecated. In the 
future, promise rejections that are not handled will terminate the Node.js 
process with a non-zero exit code.
2018-06-30T12:34:52.721215+00:00 heroku[web.1]: Error R10 (Boot timeout) -> 
Web process failed to bind to $PORT within 60 seconds of launch
2018-06-30T12:34:52.721306+00:00 heroku[web.1]: Stopping process with SIGKILL
2018-06-30T12:34:52.860272+00:00 heroku[web.1]: State changed from starting 
to crashed
2018-06-30T12:34:52.863587+00:00 heroku[web.1]: State changed from crashed to 
starting
2018-06-30T12:34:52.841500+00:00 heroku[web.1]: Process exited with status 
137
2018-06-30T12:34:54.755270+00:00 heroku[web.1]: Starting process with command 
`node app.js`
2018-06-30T12:34:56.835821+00:00 app[web.1]: You are listening to port 3000
2018-06-30T12:34:56.863257+00:00 app[web.1]: (node:4) 
UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to 
server [localhost:27017] on first connect [MongoNetworkError: connect 
ECONNREFUSED 127.0.0.1:27017]
2018-06-30T12:34:56.863262+00:00 app[web.1]: at Pool.<anonymous> 
(/app/node_modules/mongodb-core/lib/topologies/server.js:505:11)
2018-06-30T12:34:56.863264+00:00 app[web.1]: at emitOne (events.js:116:13)
2018-06-30T12:34:56.863265+00:00 app[web.1]: at Pool.emit (events.js:211:7)
2018-06-30T12:34:56.863266+00:00 app[web.1]: at Connection.<anonymous> 
(/app/node_modules/mongodb-core/lib/connection/pool.js:329:12)
2018-06-30T12:34:56.863267+00:00 app[web.1]: at Object.onceWrapper 
(events.js:317:30)
2018-06-30T12:34:56.863268+00:00 app[web.1]: at emitTwo (events.js:126:13)
2018-06-30T12:34:56.863269+00:00 app[web.1]: at Connection.emit 
(events.js:214:7)
2018-06-30T12:34:56.863271+00:00 app[web.1]: at Socket.<anonymous> 
(/app/node_modules/mongodb-core/lib/connection/connection.js:245:50)
2018-06-30T12:34:56.863272+00:00 app[web.1]: at Object.onceWrapper 
(events.js:315:30)
2018-06-30T12:34:56.863273+00:00 app[web.1]: at emitOne (events.js:116:13)
2018-06-30T12:34:56.863274+00:00 app[web.1]: at Socket.emit (events.js:211:7)
2018-06-30T12:34:56.863275+00:00 app[web.1]: at emitErrorNT 
(internal/streams/destroy.js:64:8)
2018-06-30T12:34:56.863277+00:00 app[web.1]: at _combinedTickCallback 
(internal/process/next_tick.js:138:11)
2018-06-30T12:34:56.863278+00:00 app[web.1]: at process._tickCallback 
(internal/process/next_tick.js:180:9)
2018-06-30T12:34:56.863324+00:00 app[web.1]: (node:4) 
UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error 
originated either by throwing inside of an async function without a catch 
block, or by rejecting a promise which was not handled with .catch(). 
(rejection id: 1)
2018-06-30T12:34:56.863396+00:00 app[web.1]: (node:4) [DEP0018] 
DeprecationWarning: Unhandled promise rejections are deprecated. In the 
future, promise rejections that are not handled will terminate the Node.js 
process with a non-zero exit code.
2018-06-30T12:35:11.726745+00:00 heroku[router]: at=error code=H20 desc="App 
boot timeout" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=68e14a23-255a-4c6d-99d6-525727a2b800 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:35:55.215653+00:00 heroku[web.1]: Error R10 (Boot timeout) -> 
Web process failed to bind to $PORT within 60 seconds of launch
2018-06-30T12:35:55.215699+00:00 heroku[web.1]: Stopping process with SIGKILL
2018-06-30T12:35:55.296657+00:00 heroku[web.1]: Process exited with status 
137
2018-06-30T12:35:55.314683+00:00 heroku[web.1]: State changed from starting 
to crashed
2018-06-30T12:35:56.892537+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=e9ed60ed-3dc5-42a8-86d8-e60942c803f5 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:36:01.869896+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=cd84ae69-d3c2-4ab1-892b-4dc933048c77 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:36:03.805047+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=b9455320-0f8e-4d28-8793-612d47635954 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T12:58:34.550597+00:00 heroku[web.1]: State changed from crashed to 
starting
2018-06-30T12:58:36.492786+00:00 heroku[web.1]: Starting process with command 
`node app.js`
2018-06-30T12:58:38.568708+00:00 app[web.1]: You are listening to port 3000
2018-06-30T12:58:38.590986+00:00 app[web.1]: (node:4) 
UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to 
server [localhost:27017] on first connect [MongoNetworkError: connect 
ECONNREFUSED 127.0.0.1:27017]
2018-06-30T12:58:38.590989+00:00 app[web.1]: at Pool.<anonymous> 
(/app/node_modules/mongodb-core/lib/topologies/server.js:505:11)
2018-06-30T12:58:38.590991+00:00 app[web.1]: at emitOne (events.js:116:13)
2018-06-30T12:58:38.590992+00:00 app[web.1]: at Pool.emit (events.js:211:7)
2018-06-30T12:58:38.590993+00:00 app[web.1]: at Connection.<anonymous> 
(/app/node_modules/mongodb-core/lib/connection/pool.js:329:12)
2018-06-30T12:58:38.590994+00:00 app[web.1]: at Object.onceWrapper 
(events.js:317:30)
2018-06-30T12:58:38.590995+00:00 app[web.1]: at emitTwo (events.js:126:13)
2018-06-30T12:58:38.590996+00:00 app[web.1]: at Connection.emit 
(events.js:214:7)
2018-06-30T12:58:38.590997+00:00 app[web.1]: at Socket.<anonymous> 
(/app/node_modules/mongodb-core/lib/connection/connection.js:245:50)
2018-06-30T12:58:38.590999+00:00 app[web.1]: at Object.onceWrapper 
(events.js:315:30)
2018-06-30T12:58:38.591000+00:00 app[web.1]: at emitOne (events.js:116:13)
2018-06-30T12:58:38.591001+00:00 app[web.1]: at Socket.emit (events.js:211:7)
2018-06-30T12:58:38.591015+00:00 app[web.1]: at emitErrorNT 
(internal/streams/destroy.js:64:8)
2018-06-30T12:58:38.591017+00:00 app[web.1]: at _combinedTickCallback 
(internal/process/next_tick.js:138:11)
2018-06-30T12:58:38.591018+00:00 app[web.1]: at process._tickCallback 
(internal/process/next_tick.js:180:9)
2018-06-30T12:58:38.591063+00:00 app[web.1]: (node:4) 
UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error 
originated either by throwing inside of an async function without a catch 
block, or by rejecting a promise which was not handled with .catch(). 
(rejection id: 1)
2018-06-30T12:58:38.591132+00:00 app[web.1]: (node:4) [DEP0018] 
DeprecationWarning: Unhandled promise rejections are deprecated. In the 
future, promise rejections that are not handled will terminate the Node.js 
process with a non-zero exit code.
2018-06-30T12:59:37.052499+00:00 heroku[web.1]: Error R10 (Boot timeout) -> 
Web process failed to bind to $PORT within 60 seconds of launch
2018-06-30T12:59:37.052596+00:00 heroku[web.1]: Stopping process with SIGKILL
2018-06-30T12:59:37.173301+00:00 heroku[web.1]: State changed from starting 
to crashed
2018-06-30T12:59:37.139128+00:00 heroku[web.1]: Process exited with status 
137
2018-06-30T13:00:15.376173+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/" host=maan-singh.herokuapp.com 
request_id=5449c1e7-e849-4192-a691-7a7c1e71f530 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https
2018-06-30T13:00:17.426839+00:00 heroku[router]: at=error code=H10 desc="App 
crashed" method=GET path="/favicon.ico" host=maan-singh.herokuapp.com 
request_id=5b02acc8-7218-4bd3-8c3a-a8183000c363 fwd="103.47.59.2" dyno= 
connect= service= status=503 bytes= protocol=https

我的应用程序的链接地址为https://maan-singh.herokuapp.com/

我使用了本地的MongoDB数据库项目，甚至尝试使用heroku open命令推送该项目，并且在没有从命令提示符启动MongoDB的情况下，但没有用。 在这种情况下，我没有使用GitHub存储库来推送代码，因为我的计算机中已有文件。 这是错误的原因吗？

请让我知道需要更多信息。 谢谢。

Answer 1

Web process failed to bind to $PORT within 

通常，您得到的错误表示您已在主节点或索引节点js文件中分配了一个硬编码端口。 这导致Heroku在启动时尝试将其选择的随机端口分配给您的节点应用程序时崩溃。 因此，您的应用程序无法启动。

要解决此问题，您将必须为节点应用程序设置端口，如下所示。

const PORT = process.env.PORT || 3000; 
...
...
.listen(PORT); // START YOUR SERVER HERE

当您在本地运行节点应用程序时，这将允许您在其上运行节点应用程序，并将此代码推送到Heroku时，它将分配一个可用的随机端口来修复错误。