我一直在嘗試部署一個 lambda 函數，然后通過 API 網關使其可訪問。我的 java 函數在 JAVA 中，這是我在 JAVA 中創建一個簡單的 AWS lambda 函數所遵循的文檔：https://docs.aws.amazon.com/lambda/latest/dg/java-handler-io-type-pojo.html這是我的函數處理程序的外觀：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); } }這是這個請求類：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() { }}這是響應類：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網關來觸發它，當我使用郵遞員時，當我到達API網關給出的端點時一切正常（https://www.getpostman.com/）但是通過瀏覽器嘗試相同的操作會給我一個 CORS 錯誤：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.我嘗試在 API 網關控制臺中啟用 CORS，然后重新部署它：這篇 Stackoverflow 帖子（在 AWS Lambda 上配置 CORS 響應標頭？）說如果我使用 lambda-proxy，我應該在處理程序響應本身中包含標頭，我不確定代理是什么，但我如何用我當前的Lambda 函數的實現，即在我的響應中包含自定義標頭
2 回答
largeQ
TA貢獻2039條經驗 獲得超8個贊
要啟用cors連接到 lambda 函數的 api 網關端點，您必須為 api 端點啟用 cors（您已經完成）并配置您的 lambda 函數 suport cors。
按照我的例子：
// 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"}
}
}
我的方式僅在 api 網關使用LAMBDA-PROXY事件配置時生效（默認）
慕哥9229398
TA貢獻1877條經驗 獲得超6個贊
您可以從 api 網關啟用 cors 您可以從 lambda 管理 cors 并從 lambda 管理標頭。
我建議從 api 網關啟用 cors 并測試它是否可以工作。
你可以管理access-control-origin并headers喜歡這種方式
'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);
};
您可以參考此文檔： https ://serverless.com/framework/docs/providers/aws/events/apigateway/
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