Help Center> FunctionGraph> FAQs> Trigger Management FAQs> What If Error Code 500 Is Reported When Functions that Use APIG Triggers Return Strings?
Updated on 2022-08-19 GMT+08:00
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What If Error Code 500 Is Reported When Functions that Use APIG Triggers Return Strings?

Ensure that the function response for an invocation by API Gateway has been encapsulated and contains body(String), statusCode(int), headers(Map), and isBase64Encoded(boolean).

The following is an example response returned by a Node.js function that uses an APIG trigger:

exports.handler = function (event, context, callback) {
    const response = {
        'statusCode': 200,
        'isBase64Encoded': false,
        'headers': {
            "Content-type": "application/json"
        },
        'body': 'Hello, FunctionGraph with APIG',
    }
    callback(null, response);
}

The following is an example response returned by a Java function that uses an APIG trigger:

import java.util.Map;

public HttpTriggerResponse index(String event, Context context){
        String body = "<html><title>FunctionStage</title>"
                + "<h1>This is a simple APIG trigger test</h1><br>"
                + "<h2>This is a simple APIG trigger test</h2><br>"
                + "<h3>This is a simple APIG trigger test</h3>"
                + "</html>";
        int code = 200;
        boolean isBase64 = false;
        Map<String, String> headers = new HashMap<String, String>();
        headers.put("Content-Type", "text/html; charset=utf-8");
        return new HttpTriggerResponse(body, headers, code, isBase64);
    }


class HttpTriggerResponse {
    private String body;
    private Map<String, String> headers;
    private int statusCode;
    private boolean isBase64Encoded;
    public HttpTriggerResponse(String body, Map<String,String> headers, int statusCode, boolean isBase64Encoded){
        this.body = body;
        this.headers = headers;
        this.statusCode = statusCode;
        this.isBase64Encoded = isBase64Encoded;
    }
}
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