问题描述
我正在使用Logic App将消息发送到Azure上的服务总线.逻辑应用程序以触发器的HTTP请求开头，该请求的主体中包含JSON负载.请求的正文"设置为发送消息"操作的内容.由于发布时有效负载为JSON，因此我将Content-Type设置为application/json.这会在发送消息"操作上生成错误；
I'm using Logic App to send a message to a service bus on Azure. The logic app starts with a HTTP Request for the trigger which contains a JSON payload in the body. The 'Body' of the request is set as the Content of the Send Message action. Since the payload is JSON when posting I set the Content-Type to application/json. This generates an error on the Send Message action;
{代码":"InvalidTemplate"，消息":在操作'Send_message'中无法处理模板语言表达式.输入"1"行和"1221"列:模板语言函数"encodeBase64"期望其参数为字符串.提供的值是对象"类型.请参见 https://aka.ms/logicexpressions#encodeBase64 有关用法的详细信息.'."}
{"code":"InvalidTemplate","message":"Unable to process template language expressions in action 'Send_message.' inputs at line '1' and column '1221': 'The template language function 'encodeBase64' expects its parameter to be a string. The provided value is of type 'Object'. Please see https://aka.ms/logicexpressions#encodeBase64 for usage details.'."}
因此尝试将Content-Type更改为text/plain并起作用吗?这是一个错误，还是应该在发送消息"操作中使用JSON之前将其转换为文本值?
So tried changing the Content-Type to text/plain and it works? Is this a bug or should convert the JSON to a text value somehow before using it in the Send Message action?
推荐答案
将消息发送到服务总线需要消息内容经过base64编码.由于您的内容是JSON，因此您需要在编码之前明确对其进行字符串化处理，即使用@encodeBase64(string(jsonContent))
Sending a message to service bus requires the message content to be base64 encoded. Since your content is a JSON, you would need to stringify it explicitly prior to encoding, i.e. use @encodeBase64(string(jsonContent))
将内容类型更改为文本/纯文本具有相同的效果，因为在这种情况下，内容被视为字符串开头.
Changing the content type to text/plain has the same effect, since in that case the content is treated as a string to begin with.
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