设置请求的 URL
问题
您希望动态设置 HTTP 请求节点的 URL。
解决方案
设置 HTTP 请求 节点的 URL 属性。
示例
[{"id":"b36aa30.3a7276","type":"http request","z":"c9a81b70.8abed8","name":"","method":"GET","ret":"txt","url":"","x":470,"y":300,"wires":[["1ef9987c.956c78"]]},{"id":"11167f67.5d5031","type":"inject","z":"c9a81b70.8abed8","name":"cars on craigslist","topic":"","payload":"http://vancouver.craigslist.org/search/sss?format=rss&query=cars","payloadType":"str","repeat":"","crontab":"","once":false,"x":140,"y":300,"wires":[["70154cd4.de1444"]]},{"id":"70154cd4.de1444","type":"change","z":"c9a81b70.8abed8","name":"","rules":[{"t":"set","p":"url","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":310,"y":300,"wires":[["b36aa30.3a7276"]]},{"id":"1ef9987c.956c78","type":"debug","z":"c9a81b70.8abed8","name":"","active":true,"console":"false","complete":"false","x":630,"y":300,"wires":[]}]
Inject 节点生成一个字符串 URL，Change 节点设置 msg.url 属性。在此流程中，URL 设置为
http://vancouver.craigslist.org/search/sss?format=rss&query=cars
在 Craigslist 上返回温哥华待售汽车的 RSS 提要。它在调试窗口中返回类似以下 XML 内容
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns="http://purl.org/rss/1.0/"
xmlns:enc="http://purl.oclc.org/net/rss_2.0/enc#"
xmlns:ev="http://purl.org/rss/1.0/modules/event/"
xmlns:content="http://purl.org/rss/1.0/modules/content/"
xmlns:dcterms="http://purl.org/dc/terms/"
xmlns:syn="http://purl.org/rss/1.0/modules/syndication/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/"
xmlns:admin="http://webns.net/mvcb/"
>
<channel rdf:about="https://vancouver.craigslist.ca/search/sss?format=rss&query=cars">
<title>craigslist vancouver, BC | for sale search "cars"</title>
<link>https://vancouver.craigslist.ca/search/sss?query=cars</link>
<description></description>
<dc:language>en-us</dc:language>
<dc:rights>copyright 2017 craiglist</dc:rights>
<dc:publisher>robot@craigslist.org</dc:publisher>
<dc:creator>robot@craigslist.org</dc:creator>
<dc:source>https://vancouver...
讨论
可以在 HTTP 请求 后添加一个 XML 节点，将返回的 XML RSS 内容更改为 JavaScript 对象，以便轻松访问数据。
