[英]Including Access-control-header in AWS lambda function in java
I have been trying to deploy a lambda function and then make it accessible through API-gateway. 我一直在尝试部署lambda函数,然后通过API网关对其进行访问。 My java function is in JAVA and this is the documentation I followed to create a simple AWS lambda function in JAVA: 我的Java函数在JAVA中,这是我在JAVA中创建简单的AWS lambda函数所遵循的文档:
https://docs.aws.amazon.com/lambda/latest/dg/java-handler-io-type-pojo.html https://docs.aws.amazon.com/lambda/latest/dg/java-handler-io-type-pojo.html
This is how my function handler looks: 这是我的函数处理程序的外观:
package lambda;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import lambda.axon.Path;
public class shortestPath implements RequestHandler<RequestClass, ResponseClass>{
public ResponseClass handleRequest(RequestClass request, Context context){
String inputString = request.inputString;
int steps = Path.stepsTo(inputString);
return new ResponseClass(steps);
}
}
This is this request class: 这是此请求类:
package lambda;
public class RequestClass {
String inputString;
public String getInputString() {
return inputString;
}
public void setInputString(String inputString) {
this.inputString = inputString;
}
public RequestClass(String inputString) {
this.inputString = inputString;
}
public RequestClass() {
}
}
And this the response class: 这是响应类:
package lambda;
public class ResponseClass {
int steps;
public ResponseClass(int steps) {
this.steps = steps;
}
public ResponseClass() {
}
public int getSteps() {
return steps;
}
public void setSteps(int steps) {
this.steps = steps;
}
}
I deploy this on aws and configure AWS api gateway to trigger it , everything works fine when I hit the end-point given by the API gateway when I use postman( https://www.getpostman.com/ ) 我将其部署在aws上并配置AWS api网关来触发它,当我使用postman( https://www.getpostman.com/ )到达API网关给定的端点时,一切工作正常
But trying the same through a browser gives me a CORS error: 但是通过浏览器尝试同样的操作会给我一个CORS错误:
Access to XMLHttpRequest at 'https://<hash>execute-api.us-east-1.amazonaws.com/dev' from origin 'http://localhost:4200' has been blocked by CORS policy: Request header field access-control-allow-origin is not allowed by Access-Control-Allow-Headers in preflight response.
I tried enabling CORS in the API gateway console and then redeploying it: 我尝试在API网关控制台中启用CORS,然后重新部署它:
This Stackoverflow post( Configure CORS response headers on AWS Lambda? ) says if I am using a lambda-proxy I should have the headers in the handler response itself, I am not sure what a proxy is but how I can do that with my current implementation of the Lambda function ie include custom headers in my Response 这篇Stackoverflow帖子( 在AWS Lambda上配置CORS响应标头? )说,如果我使用lambda-proxy,我应该在处理程序响应本身中包含标头,但我不确定代理是什么,但是如何使用当前的代理来做到这一点。函数的实现,即在我的响应中包含自定义标头
To enable cors
for a api gateway endpoint what connects to a lambda function, you have to enable cors for api endpoint (you have done) AND config your lambda function suport cors
. 要启用cors
的API网关端点什么连接到拉姆达功能,您必须启用API端点CORS(你这样做)和配置您的lambda表达式询问服务cors
。
Follow my example: 跟随我的例子:
// new respose class, replace for your class - ResponseClass
public class Response {
private int statusCode; // http status code
private Map<String, String> headers; // headers
private String body; // body - what you want to return to client
public Response(int statusCode, Map<String, String> headers, String body) {
this.statusCode = statusCode;
this.headers = headers;
this.body = body;
}
public int getStatusCode() {
return statusCode;
}
public Map<String, String> getHeaders() {
return headers;
}
public String getBody() {
return body;
}
public void setStatusCode(int statusCode) {
this.statusCode = statusCode;
}
public void setHeaders(Map<String, String> headers) {
this.headers = headers;
}
public void setBody(String body) {
this.body = body;
}
}
/// -------------
package lambda;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import lambda.axon.Path;
public class shortestPath implements RequestHandler<RequestClass, Response>{
public Response handleRequest(RequestClass request, Context context){
String inputString = request.inputString;
int steps = Path.stepsTo(inputString);
Map<String, String> headers = new HashMap<>();
headers.put(Access-Control-Allow-Origin, "*"); // cors header, you can add another header fields
return new Response(200, headers, "" + steps);
// return new Response(200, headers, "{result: " + steps + "}");
// simple json response. ex: {result: '3433"}
}
}
My way only effect when api gatewateway use LAMBDA-PROXY
event config (default) 我的方式仅在api gatewateway使用LAMBDA-PROXY
事件配置时有效(默认)
you can enable cors from api gateway you can manage cors from lambda and manage the headers from lambda. 您可以从api网关启用cors,也可以从lambda管理cors和从lambda管理标头。
i would suggest to enable cors from api gateway and test it will work. 我建议从api网关启用cors并测试它是否可以工作。
you can manage access-control-origin
and headers
like this way 您可以access-control-origin
这种方式管理access-control-origin
和headers
'use strict';
module.exports.hello = function(event, context, callback) {
const response = {
statusCode: 200,
headers: {
"Access-Control-Allow-Origin" : "*", // Required for CORS support to work
"Access-Control-Allow-Credentials" : true // Required for cookies, authorization headers with HTTPS
},
body: JSON.stringify({ "message": "Hello World!" })
};
callback(null, response);
};
you can refer this documentation : https://serverless.com/framework/docs/providers/aws/events/apigateway/ 您可以参考以下文档: https : //serverless.com/framework/docs/providers/aws/events/apigateway/
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