Node.js

1. Create a new directory namedhelloworld and change directory into it:

      mkdir helloworld   cd helloworld

2. Create apackage.json file in thehelloworld directory to specifyNode.js dependencies:

   {"name":"nodejs-docs-samples-functions-hello-world-get","version":"0.0.1","private":true,"license":"Apache-2.0","author":"Google Inc.","repository":{"type":"git","url":"https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git"},"engines":{"node":">=16.0.0"},"scripts":{"test":"c8 mocha -p -j 2 test/*.test.js --timeout=6000 --exit"},"dependencies":{"@google-cloud/functions-framework":"^3.1.0"},"devDependencies":{"c8":"^10.0.0","gaxios":"^6.0.0","mocha":"^10.0.0","wait-port":"^1.0.4"}}

3. Create anindex.js file in thehelloworld directory with the followingNode.js sample:

   constfunctions=require('@google-cloud/functions-framework');// Register an HTTP function with the Functions Framework that will be executed// when you make an HTTP request to the deployed function's endpoint.functions.http('helloGET',(req,res)=>{res.send('Hello World!');});

Python

1. Create a new directory namedhelloworld and change directory into it:

      mkdir helloworld   cd helloworld

2. Create arequirements.txt file in thehelloworld directory, to specifyPython dependencies:

   functions-framework==3.9.2flask==3.0.3google-cloud-error-reporting==1.11.1MarkupSafe==2.1.3

   This adds packages needed by the sample.

3. Create amain.py file in thehelloworld directory with the followingPython sample:

   importfunctions_framework@functions_framework.httpdefhello_get(request):"""HTTP Cloud Function.    Args:        request (flask.Request): The request object.        <https://flask.palletsprojects.com/en/1.1.x/api/#incoming-request-data>    Returns:        The response text, or any set of values that can be turned into a        Response object using `make_response`        <https://flask.palletsprojects.com/en/1.1.x/api/#flask.make_response>.    Note:        For more information on how Flask integrates with Cloud        Functions, see the `Writing HTTP functions` page.        <https://cloud.google.com/functions/docs/writing/http#http_frameworks>    """return"Hello World!"

Go

1. Create a new directory namedhelloworld and change directory into it:

      mkdir helloworld   cd helloworld

2. Create ago.mod file to declare thego module:

   modulegithub.com/GoogleCloudPlatform/golang-samples/functions/functionsv2/helloworldgo1.24.0requiregithub.com/GoogleCloudPlatform/functions-framework-gov1.8.1require(github.com/cloudevents/sdk-go/v2v2.15.2// indirectgithub.com/google/go-cmpv0.6.0// indirectgithub.com/google/uuidv1.6.0// indirectgithub.com/json-iterator/gov1.1.12// indirectgithub.com/modern-go/concurrentv0.0.0-20180306012644-bacd9c7ef1dd// indirectgithub.com/modern-go/reflect2v1.0.2// indirectgithub.com/stretchr/testifyv1.10.0// indirectgo.uber.org/multierrv1.11.0// indirectgo.uber.org/zapv1.27.0// indirectgolang.org/x/timev0.9.0// indirect)

3. Create anhello_http.go file in thehelloworld directory with thefollowing Go code sample:

   // Package helloworld provides a set of Cloud Functions samples.packagehelloworldimport("fmt""net/http""github.com/GoogleCloudPlatform/functions-framework-go/functions")funcinit(){functions.HTTP("HelloGet",helloGet)}// helloGet is an HTTP Cloud Function.funchelloGet(whttp.ResponseWriter,r*http.Request){fmt.Fprint(w,"Hello, World!")}

Java

1. Create a new directory namedhelloworld and change directory into it:

      mkdir helloworld   cd helloworld

2. Create the following project structure to contain the source directoryand source file:

   mkdir -p ~/helloworld/src/main/java/functionstouch ~/helloworld/src/main/java/functions/HelloWorld.java

3. Update theHelloWorld.java file with the following Java code sample:

   packagefunctions;importcom.google.cloud.functions.HttpFunction;importcom.google.cloud.functions.HttpRequest;importcom.google.cloud.functions.HttpResponse;importjava.io.BufferedWriter;importjava.io.IOException;publicclassHelloWorldimplementsHttpFunction{// Simple function to return "Hello World"@Overridepublicvoidservice(HttpRequestrequest,HttpResponseresponse)throwsIOException{BufferedWriterwriter=response.getWriter();writer.write("Hello World!");}}

4. Create apom.xml file in thehelloworld directory, and add the followingJava dependencies:

   <?xmlversion="1.0"encoding="UTF-8"?><!--Copyright2020GoogleLLCLicensedundertheApacheLicense,Version2.0(the"License");youmaynotusethisfileexceptincompliancewiththeLicense.YoumayobtainacopyoftheLicenseathttp://www.apache.org/licenses/LICENSE-2.0Unlessrequiredbyapplicablelaworagreedtoinwriting,softwaredistributedundertheLicenseisdistributedonan"AS IS"BASIS,WITHOUTWARRANTIESORCONDITIONSOFANYKIND,eitherexpressorimplied.SeetheLicenseforthespecificlanguagegoverningpermissionsandlimitationsundertheLicense.--><projectxmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.example.functions</groupId><artifactId>functions-hello-world</artifactId><version>1.0.0-SNAPSHOT</version><parent><groupId>com.google.cloud.samples</groupId><artifactId>shared-configuration</artifactId><version>1.2.0</version></parent><dependencyManagement><dependencies><dependency><artifactId>libraries-bom</artifactId><groupId>com.google.cloud</groupId><scope>import</scope><type>pom</type><version>26.32.0</version></dependency></dependencies></dependencyManagement><properties><maven.compiler.target>11</maven.compiler.target><maven.compiler.source>11</maven.compiler.source></properties><dependencies><!--RequiredforFunctionprimitives--><dependency><groupId>com.google.cloud.functions</groupId><artifactId>functions-framework-api</artifactId><version>1.1.0</version><scope>provided</scope></dependency><!--Thefollowingdependenciesareonlyrequiredfortesting--><dependency><groupId>com.google.truth</groupId><artifactId>truth</artifactId><version>1.4.0</version><scope>test</scope></dependency><dependency><groupId>com.google.guava</groupId><artifactId>guava-testlib</artifactId><scope>test</scope></dependency><dependency><groupId>org.mockito</groupId><artifactId>mockito-core</artifactId><version>5.10.0</version><scope>test</scope></dependency></dependencies><build><plugins><plugin><!--GoogleCloudFunctionsFrameworkMavenpluginThispluginallowsyoutorunCloudFunctionsJavacodelocally.Usethefollowingterminalcommandtorunagivenfunctionlocally:mvnfunction:run-Drun.functionTarget=your.package.yourFunction--><groupId>com.google.cloud.functions</groupId><artifactId>function-maven-plugin</artifactId><version>0.11.0</version><configuration><functionTarget>functions.HelloWorld</functionTarget></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-surefire-plugin</artifactId><!--version3.0.0-M4doesnotloadJUnit5correctly--><!--seehttps://issues.apache.org/jira/browse/SUREFIRE-1750 --><version>3.2.5</version><configuration><includes><include>**/*Test.java</include></includes><skipTests>${skipTests}</skipTests><reportNameSuffix>sponge_log</reportNameSuffix><trimStackTrace>false</trimStackTrace></configuration></plugin></plugins></build></project>

Ruby

1. Create a new directory namedhelloworld and change directory into it:

      mkdir helloworld   cd helloworld

2. Create a file namedapp.rb and paste the following code into it:

   require"functions_framework"FunctionsFramework.http"hello_get"do|_request|# The request parameter is a Rack::Request object.# See https://www.rubydoc.info/gems/rack/Rack/Request# Return the response body as a string.# You can also return a Rack::Response object, a Rack response array, or# a hash which will be JSON-encoded into a response."Hello World!"end

3. Create a file namedGemfile and copy the following into it:

   source"https://rubygems.org"gem"base64","~> 0.2"gem"functions_framework","~> 1.4"

4. If you don't have Bundler 2.0 or greater installed, installBundler.

5. Generate aGemfile.lock file by running:

   bundle install

PHP

1. Create a new directory namedhelloworld and change directory into it:

      mkdir helloworld   cd helloworld

2. Create a file namedindex.php and paste the following code into it:

   use Psr\Http\Message\ServerRequestInterface;function helloGet(ServerRequestInterface $request): string{    return 'Hello, World!' . PHP_EOL;}

3. If you aren't using Cloud Shell, create acomposer.json file andpaste the following code into it:

   {    "require": {        "google/cloud-functions-framework": "^1.0"    },    "scripts": {        "start": [           "Composer\\Config::disableProcessTimeout",           "FUNCTION_TARGET=helloGet php -S localhost:${PORT:-8080} vendor/google/cloud-functions-framework/router.php"        ]    }}

.NET

1. Install.NET SDK.

2. From the console, create a new empty web project using the dotnetcommand.

   dotnet new web -o helloworld-csharp

3. Change directory tohelloworld-csharp:

4. Replace the sample code in the project filehelloworld-csharp.csprojwith the following:

   <Project Sdk="Microsoft.NET.Sdk">  <PropertyGroup>    <OutputType>Exe</OutputType>    <TargetFramework>net8.0</TargetFramework>  </PropertyGroup>  <ItemGroup>    <PackageReference Include="Google.Cloud.Functions.Hosting" Version="3.0.1" />  </ItemGroup></Project>

5. Replace the sample code inProgram.cs file with the following:

   using Google.Cloud.Functions.Framework;using Microsoft.AspNetCore.Http;using System.Threading.Tasks;namespace HelloWorld;public class Function : IHttpFunction{    public async Task HandleAsync(HttpContext context)    {        await context.Response.WriteAsync("Hello World!", context.RequestAborted);    }}

Console

To delete a service:

1. In the Google Cloud console, go to the Cloud RunServices page:

   Go to Cloud Run

2. Locate the service you want to delete in the services list, and clickits checkbox to select it.

3. ClickDelete. This deletes all revisions of the service.

gcloud

To delete a service, run the following command:

gcloud run services deleteSERVICE --regionREGION

Replace the following:

• SERVICE: name of your service.
• REGION: Google Cloud region of the service.