无法将请求正文解析为json:意外字符(\'-\'(代码45))AWS Lambda + API + Postman [英] Could not parse request body into json: Unexpected character (\'-\' (code 45)) AWS Lambda + API + Postman

问题描述

我已经尝试了几天，以将参数从AWS中的API网关发送到Lambda函数，但没有成功.

I have been trying for a few days to get a parameter sent from the API Gateway in AWS to a Lambda function and I am having no success.

我决定从头开始，因此我遵循了他们的演练(

I decided to start from the beginning so I followed their walkthrough (http://docs.aws.amazon.com/apigateway/latest/developerguide/getting-started.html#getting-started-new-lambda)

我已经两次检查了本演练，并按照步骤执行了.

I have checked this walkthrough twice and I have followed the steps to the letter.

当我从Postman或Swift中测试API时，出现错误:

When I test the API from Postman or in Swift I am getting the error:

{"message":无法将请求正文解析为json:数字值中的意外字符(\'-\'(代码45)):有效数字值的预期数字(0-9)跟随减号\ n [来源:[B @ c036d15；第1行，第3列]}

{"message": "Could not parse request body into json: Unexpected character (\'-\' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value\n at [Source: [B@c036d15; line: 1, column: 3]"}

在邮递员中，当我以JSON格式查看结果时，

In postman, When I view the result as JSON I just get

字符串错误

Bad String

Lambda函数

该功能是演练中的基本示例:

Lambda Function

The function is the basic example from the Walkthrough:

console.log('Loading event');

exports.handler = function(event, context) {
  var name = (event.name === undefined ? 'No-Name' : event.name);
  console.log('"Hello":"' + name + '"');
  context.done(null, {"Hello":name}); // SUCCESS with message
};

从Lambda控制台进行测试并使用测试"数据得到结果:

When Tested from the Lambda Console and with the Test data I get the result:

{
    "Hello": "TestUser123"
}

在通过API网关测试进行测试时，结果也是:

When Tested from the API Gateway Test, The result is also:

 {
    "Hello": "TestUser123"
}

谁能看到为什么两个测试控制台都允许这项工作，但是当用POSTMAN进行测试或在Swift脚本中使用时却无法正常工作吗?

Can anyone see why both test consoles are allowing this work but when tested with POSTMAN or used within a Swift Script it does not work ?

在邮递员中，我已将内容类型设置为 application/json

In postman, I have set the content-type to application/json

脚本返回默认值:

 {
    "Hello": "user"
}

但是，当我在POSTMAN中添加参数 name 和 TestUser123 时，这是它返回错误的时间.

However, When I add in the parameters name and TestUser123 in POSTMAN, this is when it returns the error.

好，所以我将映射模板更改为在另一个答案中找到的映射模板:

Ok, so I changed the mapping template to one that I found on another answer:

{ "name": "$input.params('name')" }

现在的结果是:

{
   "Hello": ""
}

有什么想法为什么没有得到这个名字?

Any Ideas why it is not getting the name?

推荐答案

我今天刚被困住了.

您的映射模板是:

{ "name": "$input.params('name')" }

AWS使用AWS Velocity模板；即使看起来像JSON，也有所不同.

AWS uses AWS Velocity templates, which; even though looks like JSON, is different.

如果您使用

{ "name": $input.params('name') } // notice no quotes

直接在集成请求步骤中获取映射模板，然后它将按预期工作.

for the mapping template right at the integration request step, then it should work as expected.

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