问题描述
通过github aciton部署azure app service服务的时候，遇见400报错。
报错信息非常简单：
Starting deployment for web app...
Package deployment using OneDeploy initiated.
Error: Failed to deploy web package to App Service.
Error: Deployment Failed, Error: Failed to deploy web package using OneDeploy to App Service.
Bad Request (CODE: 400)
这个问题应该如何调查呢？
问题解答
在Github Aciton中，使用 Azure WebApp(azure/webapps-deploy@v3)来部署App Service的应用, 这次部署的是一个jar包。
Github Action 脚本:
- name: Azure WebApp
uses: azure/webapps-deploy@v3
with:
app-name: '<app service name>'
package: ${{ github.workspace }}/target/*.jar
查看Azure文档，介绍部署java应用时，使用az cli命令，github action和maven 插件都是使用的Kudu OneDeploy接口( https://<your web app>.scm.chinacloudsites.cn/api/publish?type=jar )
根据以上信息，就尝试使用az webapp deploy命令直接部署jar包应用，发现多了一句错误提示信息：
> az webapp deploy --resource-group <your resource group name> --name <your app service name> --src-path myjava.jar --type jar
Initiating deployment
Deploying from local path: myjava.jar
An error occurred during deployment. Status Code: 400,
Details: "Artifact type = 'Jar' cannot be deployed to stack = 'TOMCAT'. Site should be configured to run with stack = JAVA",
Please visit https://XXXXXXXXX.scm.chinacloudsites.cn/api/deployments/latest to get more information about your deployment
这句错误消息非常关键(Artifact type = 'Jar' cannot be deployed to stack = 'TOMCAT'. Site should be configured to run with stack = JAVA")。
在查看App Service的配置信息后，Stack果然设置为Tomcat。
因为这里只有两种选项( Tomcat 和Java SE )。于是，修改为Java SE后，再次部署jar包。
成功。
当问题解决后，想进一步验证是否是one deploy接口对jar包的强制限制。
恰好kudu也是开源项目，所以，进入github kudu 仓库 (源码：https://github.com/projectkudu/kudu/tree/master )，使用错误消息关键字整库搜索“cannot be deployed to stack”，最终，定位到 PushDeploymentController.cs 中，有如下的验证条件：
- 当部署的文件为Jar时，需要判断目标App Service的Stack只能是JavaSE。如果不是，返回400的状态码
附录一：使用 curl 命令直接调用接口也可以复现问题，效果和az webapp deploy命令相同
curl -X POST \ -u user:password \ -T "/Users/Downloads/xxxxx-0.0.1-SNAPSHOT.jar" \ "https://xxxxx.scm.chinacloudsites.cn/api/publish?type=jar" \ -v * Host xxxxx.scm.chinacloudsites.cn:443 was resolved. * IPv6: (none) * IPv4: 159.27.20.0 * Trying 159.27.20.0:443... * Connected to xxxxx.scm.chinacloudsites.cn (159.27.20.0) port 443 * ALPN: curl offers h2,http/1.1 * (304) (OUT), TLS handshake, Client hello (1): * CAfile: /etc/ssl/cert.pem * CApath: none * (304) (IN), TLS handshake, Server hello (2): * (304) (OUT), TLS handshake, Client hello (1): * (304) (IN), TLS handshake, Server hello (2): * (304) (IN), TLS handshake, Unknown (8): * (304) (IN), TLS handshake, Certificate (11): * (304) (IN), TLS handshake, CERT verify (15): * (304) (IN), TLS handshake, Finished (20): * (304) (OUT), TLS handshake, Finished (20): * SSL connection using TLSv1.3 / AEAD-AES256-GCM-SHA384 / [blank] / UNDEF * ALPN: server accepted http/1.1 * Server certificate: * subject: C=CN; ST=Shanghai; O=Shanghai Blue Cloud Technology Co., Ltd.; CN=*.chinacloudsites.cn * start date: Dec 19 00:00:00 2025 GMT * expire date: Jun 17 23:59:59 2026 GMT * subjectAltName: host "xxxxx.scm.chinacloudsites.cn" matched cert's "*.scm.chinacloudsites.cn" * issuer: C=US; O=DigiCert Inc; CN=DigiCert Basic RSA CN CA G2 * SSL certificate verify ok. * using HTTP/1.x * Server auth using Basic with user 'deploypoc' > POST /api/publish?type=jar HTTP/1.1 > Host: xxxxx.scm.chinacloudsites.cn > Authorization: Basic xxxxxxxxxxxxxxxx > User-Agent: curl/8.7.1 > Accept: */* > Content-Length: 25578166 > Expect: 100-continue > * Done waiting for 100-continue < HTTP/1.1 400 Bad Request < Content-Type: text/plain; charset=utf-8 < Date: Wed, 31 Dec 2025 03:42:36 GMT < Server: Kestrel < Set-Cookie: ARRAffinity=xxxx;Path=/;HttpOnly;Secure;Domain=xxxxx.scm.chinacloudsites.cn < Set-Cookie: ARRAffinitySameSite=xxxxx;Path=/;HttpOnly;SameSite=None;Secure;Domain=xxxxx.scm.chinacloudsites.cn < Transfer-Encoding: chunked < * HTTP error before end of send, stop sending * abort upload after having sent 589824 bytes * Closing connection Artifact type = 'Jar' cannot be deployed to stack = 'TOMCAT'. Site should be configured to run with stack = JAVA%
参考资料
App Service部署Java应用：https://docs.azure.cn/zh-cn/app-service/configure-language-java-deploy-run?tabs=linux&pivots=java-tomcat#deploying-your-app
Kudu One Deploy Source Code ： https://github.com/projectkudu/kudu/blob/master/Kudu.Services/Deployment/PushDeploymentController.cs#L304
当在复杂的环境中面临问题，格物之道需：浊而静之徐清，安以动之徐生。 云中，恰是如此!
