我的 Flask 应用程序在本地服务器上是 运行，但在 Heroku 上不是 运行。这怎么可能？
My Flask app is running on my local server, but it isn't running on Heroku. How is this possible?
这些是我的构建日志。我的应用程序显示错误。
2020-08-09T20:25:31.000000+00:00 app[api]: Build succeeded
2020-08-09T20:25:33.898890+00:00 app[web.1]: bash: gunicorn: command not found
2020-08-09T20:25:33.955046+00:00 heroku[web.1]: Process exited with status 127
2020-08-09T20:25:33.996024+00:00 heroku[web.1]: State changed from starting to crashed
2020-08-09T20:25:42.118494+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=imagen-iitb.herokuapp.com request_id=b4762bc9-5410-443d-a630-d6ea43891527 fwd="103.240.97.60" dyno= connect= service= status=503 bytes= protocol=https
2020-08-09T20:25:48.479794+00:00 heroku[web.1]: State changed from crashed to starting
2020-08-09T20:25:53.064583+00:00 heroku[web.1]: Starting process with command `gunicorn run:app`
2020-08-09T20:25:55.106853+00:00 app[web.1]: bash: gunicorn: command not found
2020-08-09T20:25:55.149435+00:00 heroku[web.1]: Process exited with status 127
2020-08-09T20:25:55.179854+00:00 heroku[web.1]: State changed from starting to crashed
这是我的 requirements.txt:
bcrypt==3.1.7
blinker==1.4
cffi==1.14.1
click==7.1.2
DateTime==4.3
email-validator==1.1.1
Flask==1.1.2
Flask-Bcrypt==0.7.1
Flask-Login==0.5.0
Flask-Mail==0.9.1
Flask-SQLAlchemy==2.4.4
Flask-WTF==0.14.3
googleapis-common-protos==1.52.0
httplib2==0.18.1
idna==2.10
itsdangerous==1.1.0
Jinja2==2.11.2
jws==0.1.3
MarkupSafe==1.1.1
oauth2client==3.0.0
ordereddict==1.1
Pillow==6.2.2
protobuf==4.0.0rc2
pyasn1==0.4.8
pyasn1-modules==0.2.8
pycparser==2.20
pycryptodome==3.4.3
Pyrebase==3.0.27
python-firebase==1.2
python-jwt==2.0.1
pytz==2020.1
requests==2.11.1
requests-toolbelt==0.7.0
rsa==4.5
six==1.15.0
SQLAlchemy==1.3.18
Werkzeug==1.0.1
WTForms==2.3.3
zope.interface==5.1.0
如果你需要，我可以提供我的代码。谢谢。
编辑：我的数据没有更新到我的 SQL-Alchemy 数据库文件 (site.db)
您忘记将 gunicorn 库添加到您的 requirements.txt。没有 gunicorn，Web 应用程序无法启动，因为它是 HTTP 服务器。要解决此问题，只需将 gunicorn==20.0.4 添加到您的 requirements.txt 即可。
这些是我的构建日志。我的应用程序显示错误。
2020-08-09T20:25:31.000000+00:00 app[api]: Build succeeded
2020-08-09T20:25:33.898890+00:00 app[web.1]: bash: gunicorn: command not found
2020-08-09T20:25:33.955046+00:00 heroku[web.1]: Process exited with status 127
2020-08-09T20:25:33.996024+00:00 heroku[web.1]: State changed from starting to crashed
2020-08-09T20:25:42.118494+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=imagen-iitb.herokuapp.com request_id=b4762bc9-5410-443d-a630-d6ea43891527 fwd="103.240.97.60" dyno= connect= service= status=503 bytes= protocol=https
2020-08-09T20:25:48.479794+00:00 heroku[web.1]: State changed from crashed to starting
2020-08-09T20:25:53.064583+00:00 heroku[web.1]: Starting process with command `gunicorn run:app`
2020-08-09T20:25:55.106853+00:00 app[web.1]: bash: gunicorn: command not found
2020-08-09T20:25:55.149435+00:00 heroku[web.1]: Process exited with status 127
2020-08-09T20:25:55.179854+00:00 heroku[web.1]: State changed from starting to crashed
这是我的 requirements.txt:
bcrypt==3.1.7
blinker==1.4
cffi==1.14.1
click==7.1.2
DateTime==4.3
email-validator==1.1.1
Flask==1.1.2
Flask-Bcrypt==0.7.1
Flask-Login==0.5.0
Flask-Mail==0.9.1
Flask-SQLAlchemy==2.4.4
Flask-WTF==0.14.3
googleapis-common-protos==1.52.0
httplib2==0.18.1
idna==2.10
itsdangerous==1.1.0
Jinja2==2.11.2
jws==0.1.3
MarkupSafe==1.1.1
oauth2client==3.0.0
ordereddict==1.1
Pillow==6.2.2
protobuf==4.0.0rc2
pyasn1==0.4.8
pyasn1-modules==0.2.8
pycparser==2.20
pycryptodome==3.4.3
Pyrebase==3.0.27
python-firebase==1.2
python-jwt==2.0.1
pytz==2020.1
requests==2.11.1
requests-toolbelt==0.7.0
rsa==4.5
six==1.15.0
SQLAlchemy==1.3.18
Werkzeug==1.0.1
WTForms==2.3.3
zope.interface==5.1.0
如果你需要，我可以提供我的代码。谢谢。
编辑：我的数据没有更新到我的 SQL-Alchemy 数据库文件 (site.db)
您忘记将 gunicorn 库添加到您的 requirements.txt。没有 gunicorn，Web 应用程序无法启动，因为它是 HTTP 服务器。要解决此问题，只需将 gunicorn==20.0.4 添加到您的 requirements.txt 即可。