eXist-db 使用 eXPath Http_module 通过 POST 请求发送 JSON [英] eXist-db send JSON via POST request using eXPath Http_module
问题描述
我正在尝试通过 eXist-db 的 POST 请求将 JSON 发送到使用 eXPath HTTP 模块的 API，但我总是收到以下错误:
exerr:ERROR 序列化正文内容时出错我的 XQuery 看起来像:
xquery 版本3.1"；声明命名空间输出=http://www.w3.org/2010/xslt-xquery-serialization"；让 $payload := 地图 {名称":测试用户"，角色":用户"}返回hc:发送请求(<hc:request method='post'><hc:body media-type="application/json"/></hc:request>,'https://reqres.in/api/users',序列化($payload，<输出:序列化参数><output:method>json</output:method></output:serialization-parameters>))[2] =>util:base64-decode() =>解析-json()预期输出(通过 Postman 测试):
<代码>{名称":测试用户"，id":820"，createdAt":2021-06-03T05:50:32.049Z"}如何将内容序列化为 JSON 并通过来自 eXist-db 的 POST 请求发送?解决方案提示 here 不适用于我.
解决方案是在元素中添加@method="text".
EXPath HTTP 客户端规范中记录了此属性，部分 3.2 序列化请求内容:
<块引用>序列化方法的默认值取决于媒体类型:如果是XML媒体类型则为xml，如果是HTML媒体类型则为html, xhtml 如果是 application/xhtml+xml， text 如果是文本媒体类型，binary 是其他情况.>
这意味着 EXPath HTTP 客户端没有针对 application/json 媒体类型的内置映射——即，它依赖于 binary.但是 JSON 是 一种文本媒体类型，并且您已经通过 fn:serialize() 函数将 XDM 映射序列化为文本.因此，您必须覆盖 method="binary" 的 EXPath HTTP 客户端默认值，并在 上设置 method="text"代码>元素.
草案 v2 规范，简化发送JSON；默认情况下，当它检测到正文包含 map() 或 array() 时，它将使用适当的媒体类型将项目序列化为 JSON.
但是现在对于 v1，我们仍然需要显式 (1) 使用 JSON 序列化方法序列化映射和数组，以及 (2) 在 < 上指定 元素.method="text";body>
I am trying to send JSON via a POST request from eXist-db to an API using the eXPath HTTP-Module, but I'm always recieving the following Error:
exerr:ERROR Error serializing the body content
My XQuery looks like:
xquery version "3.1";
declare namespace output="http://www.w3.org/2010/xslt-xquery-serialization";
let $payload := map {
"name": "testuser",
"role": "user"
}
return
hc:send-request(
<hc:request method='post'>
<hc:body media-type="application/json"/>
</hc:request>,
'https://reqres.in/api/users',
serialize($payload, <output:serialization-parameters>
<output:method>json</output:method>
</output:serialization-parameters>)
)[2] => util:base64-decode() => parse-json()
Expected Output (tested via Postman):
{
"name": "testuser",
"id": "820",
"createdAt": "2021-06-03T05:50:32.049Z"
}
How do i serialize content to JSON and send it via a POST-request from eXist-db? The solution prompted here is not working for me.
The solution is to add @method="text" to the <body> element.
This attribute is documented in the EXPath HTTP Client spec, section 3.2 Serializing the request content:
The default value of the serialization method depends on the media-type: it is
xmlif it is an XML media type,htmlif it is an HTML media type,xhtmlif it is application/xhtml+xml,textif it is a textual media type, andbinaryfor any other case.
What this means is that the EXPath HTTP Client doesn't have a built-in mapping for the media-type of application/json—i.e., it falls back on binary. But JSON is a textual media type, and you've already performed the serialization of your XDM map into text via the fn:serialize() function. So you have to override the EXPath HTTP Client default of method="binary" and set method="text" on the <body> element.
The draft v2 spec, simplifies sending JSON; by default, when it detects that the body contains a map() or array(), it will serialize the item as JSON, with the appropriate media-type.
But for now with v1, we still need to explicitly (1) serialize maps and arrays using the JSON serialization method and (2) specify method="text" on the <body> element.
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