BaseX REST API:设置自定义HTTP响应标头 | 设置自定义HTTP响应标头

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问题描述

我想在 BaseX REST API 的所有响应中包含以下HTTP标头:

I want to include the following HTTP header to all responses by the BaseX REST API:

Access-Control-Allow-Origin: *

这可能吗?

推荐答案

BaseX在引擎盖下使用Jetty.您可以修改web.xml文件，以使Jetty发送CORS标头，但是

BaseX uses Jetty below the hood. You can modify the web.xml file to make Jetty send CORS headers, but either

至少使用添加了jetty-servlets库的BaseX 8.6.3或
必须添加 jetty-servlets jar到您的$CLASSPATH(BaseX已经发布了jetty-servlet，这是一个不同的类；请确保获取与BaseX中包含的内容相匹配的适当版本).

use at least BaseX 8.6.3 which added the jetty-servlets library or
have to add the jetty-servlets jar to your $CLASSPATH (BaseX already ships jetty-servlet, which is a different class; and be sure to fetch the appropriate version matching what's included in BaseX).

在web.xml文件中包括以下指令:

Include following directives to the web.xml file:

<web-app>
    <!-- add those before the closing web-app tag: -->
    <filter>
        <filter-name>cross-origin</filter-name>
        <filter-class>org.eclipse.jetty.servlets.CrossOriginFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>cross-origin</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

请注意，Jetty似乎不支持发布通配符标题Access-Control-Allow-Origin: * :，而默认值已经

Be aware that Jetty does not seem to support posting a wildcard header Access-Control-Allow-Origin: *: while the default is already

<init-param>
     <param-name>allowedOrigins</param-name>
     <param-value>*</param-value>
</init-param>

(将其放入<filter/>元素中)，Jetty使用它来构造一个正则表达式，并且如果匹配则始终返回Origin:请求标头的值，但这也可以为您带来好处.

(put that into the <filter/> element), Jetty uses this to construct a regular expression and always returns the value of the Origin: request header if matching, but that should also serve you well.

一个示例请求:

$ curl -v -H "Origin: http://foo.example" http://admin:admin@localhost:8984/rest
*   Trying ::1...
* Connected to localhost (::1) port 8984 (#0)
* Server auth using Basic with user 'admin'
> GET /rest HTTP/1.1
> Host: localhost:8984
> Authorization: Basic YWRtaW46YWRtaW4=
> User-Agent: curl/7.50.1
> Accept: */*
> Origin: http://foo.example
>
< HTTP/1.1 200 OK
< Content-Type: application/xml; charset=UTF-8
< Content-Length: 152
< Server: Jetty(8.1.18.v20150929)
<
<rest:databases xmlns:rest="http://basex.org/rest" resources="1">
  <rest:database resources="1" size="96234589">test</rest:database>
</rest:databases>
* Connection #0 to host localhost left intact

(该库现在默认包含在库中)

(the library is now included by default)

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