在 java 中的 AWS lambda 函数中包含 Access-control-header
我一直在尝试部署一个 lambda 函数，然后通过 API 网关使其可访问。我的 java 函数在 JAVA 中，这是我在 JAVA 中创建一个简单的 AWS lambda 函数所遵循的文档：
https://docs.aws.amazon.com/lambda/latest/dg/java-handler-io-type-pojo.html
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);
}
}
这是这个请求类：
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() {
}
}
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;
}
}
我在aws上部署它并配置AWS api网关来触发它，当我使用邮递员时，当我到达API网关给出的端点时一切正常（https://www.getpostman.com/）
但是通过浏览器尝试相同的操作会给我一个 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.
我尝试在 API 网关控制台中启用 CORS，然后重新部署它：
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，我不确定代理是什么，但我如何用我当前的Lambda 函数的实现，即在我的响应中包含自定义标头
沧海一幻觉2回答
-
largeQ
要启用cors连接到 lambda 函数的 api 网关端点，您必须为 api 端点启用 cors（您已经完成）并配置您的 lambda 函数 suport cors。按照我的例子：// new respose class, replace for your class - ResponseClasspublic 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"} } }我的方式仅在 api 网关使用LAMBDA-PROXY事件配置时生效（默认） -
慕哥9229398
您可以从 api 网关启用 cors 您可以从 lambda 管理 cors 并从 lambda 管理标头。我建议从 api 网关启用 cors 并测试它是否可以工作。你可以管理access-control-origin并headers喜欢这种方式'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);};您可以参考此文档： https ://serverless.com/framework/docs/providers/aws/events/apigateway/
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