grails - 使用 HTTPBuilder POST -> NullPointerException？

Question

我正在尝试发出一个简单的 HTTP POST 请求，但我不知道为什么以下失败。我尝试按照示例 here ，而且我不明白我哪里出错了。

异常

java.lang.NullPointerException
    at groovyx.net.http.HTTPBuilder$RequestConfigDelegate.setBody(HTTPBuilder.java:1131)
    ...

代码

def List<String> search(String query, int maxResults)
{
    def http = new HTTPBuilder("mywebsite")

    http.request(POST) {
        uri.path = '/search/'
        body = [string1: "", query: "test"]
        requestContentType = URLENC

        headers.'User-Agent' = 'Mozilla/5.0 Ubuntu/8.10 Firefox/3.0.4'

        response.success = { resp, InputStreamReader reader ->
            assert resp.statusLine.statusCode == 200

            String data = reader.readLines().join()

            println data
        }
    }
    []
}

Answer 1

我发现有必要在分配正文之前设置内容类型。这对我有用，使用 groovy 1.7.2:

@Grab(group='org.codehaus.groovy.modules.http-builder', module='http-builder', version='0.5.0' )
import groovyx.net.http.*
import static groovyx.net.http.ContentType.*
import static groovyx.net.http.Method.*

def List<String> search(String query, int maxResults)
{
    def http = new HTTPBuilder("mywebsite")

    http.request(POST) {
        uri.path = '/search/'
        requestContentType = URLENC
        headers.'User-Agent' = 'Mozilla/5.0 Ubuntu/8.10 Firefox/3.0.4'
        body = [string1: "", query: "test"]

        response.success = { resp, InputStreamReader reader ->
            assert resp.statusLine.statusCode == 200

            String data = reader.readLines().join()

            println data
        }
    }
    []
}