由网友(爱你是喜上眉梢难自控)分享简介：我想打一个Ajax请求 ChemSpider网络阿比从Web应用程序，我敢让 - 例如，使用 GetCompoundInfo 搜索功能。I want to make an Ajax request to the ChemSpider Web Api from a web application that I'm ma...

我想打一个Ajax请求 ChemSpider网络阿比从Web应用程序，我敢让 - 例如，使用 GetCompoundInfo 搜索功能。

I want to make an Ajax request to the ChemSpider Web Api from a web application that I'm making -- for example, using the GetCompoundInfo search function.

这个API返回的XML格式的数据。例如，一个搜索吡啶

This API returns its data in XML format. For example, a search for pyridine:

GetCompoundInfo?CSID=1020&token=redacted-security-token

结果

<?xml version="1.0" encoding="utf-8"?>
<CompoundInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.chemspider.com/">
  <CSID>1020</CSID>
  <InChI>InChI=1S/C5H5N/c1-2-4-6-5-3-1/h1-5H</InChI>
  <InChIKey>JUJWROOIHBZHMG-UHFFFAOYSA-N</InChIKey>
  <SMILES>C1=CC=NC=C1</SMILES>
</CompoundInfo>

好象很简单。这是我的Ajax请求：

Seemed simple enough. This was my Ajax request:

$.ajax({
  crossDomain: true,
  type: 'GET',
  url: "http://www.chemspider.com/Search.asmx/GetCompoundInfo",
  data: {
    "CSID": 1020,
    "token": "redacted-security-token",
  },
  success: function(xmlstring, st, x) {
    success_stuff(xmlstring);
  },
  failure: function(xmlstring, st, x) {
    failure_stuff(xmlstring);
  }
});

但是，服务器似乎不具有跨域，资源共享功能。

However, the server doesn't seem to have Cross-Origin-Resource-Sharing enabled.

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://www.chemspider.com/Search.asmx/CompoundInfo?CSID=1020&token=redacted-security-token. This can be fixed by moving the resource to the same domain or enabling CORS.

我不能使用JSONP，因为数据以XML格式返回，而不是JSON。并设置跨域=真似乎并不奏效。

I can't use JSONP, because the data is returned as XML, not JSON. And setting crossDomain = true doesn't seem to be working.

我如何做一个简单的GET请求到该网站的API？

How can I make a simple GET request to this web API?

推荐答案

首先，获得与ChemSpider开发团队联系。问他们，如果他们想打开API弥补CORS请求。他们可能会很乐意提供帮助。

First, get in touch with the ChemSpider development team. Ask them if they'd open the API up for CORS requests. They might be happy to help.

如果这不是一种选择，你需要设置代理，直接进行调用作为一个GET请求，而不是一个Ajax请求。然后，让你的Ajax请求命中代理，而不是API的域。

If that isn't an option, you'll need to set up a proxy which makes the calls directly as a GET request rather than an ajax request. Then make your ajax requests hit the proxy instead of the API's domain.

如果你是一个Python程序员，uwsgi和放大器;的urllib使这个pretty的简单。将下面的code为 ajaxproxy.py

If you're a python programmer, uwsgi & urllib make this pretty simple. Save the following code as ajaxproxy.py.

请注意以下几点code是仅用于演示如何工作，不解决安全问题。它有效地运行一个开放的代理。除非你想各种有趣的业务托管于该服务器上的的名义进行的，不要以此作为-是用于生产。的

"""
Run with:
    uwsgi --http :9090 --wsgi-file ajaxproxy.py
"""
import urllib2

def application(env, start_response):
    # Get the resource url from the proxy's url & query string.
    resource_base_url = env['PATH_INFO'].split('/getresource/')[-1]
    if resource_query == '':
        resource_url = resource_base_url
    else:
        resource_url = '{}?{}'.format(resource_base_url, resource_query)

    # Get the resource.
    print('Getting resource: {}'.format(resource_url))
    resource_response = urllib2.urlopen(resource_url)
    resource_content = resource_response.read()

    # Return the resource to the requester.
    start_response('200 OK', [('Content-Type','text/html'), ('Access-Control-Allow-Origin', '*')])
    return [resource_content]

uwsgi可以容易地与安装

uwsgi can be easily installed with

pip install wsgi

所有这一切将在你的Ajax请求改变将是网址：

All that would change in your ajax request would be the url:

$.ajax({
   url: 'http://127.0.0.1:9090/getresource/http://www.chemspider.com/Search.asmx/GetCompoundInfo',
...
});

课程除了开发及放任何东西;测试你需要运行一个公开可用的服务器上安装代理，改变127.0.0.1到其地址。

Of course for anything besides development & testing you'll need to run the proxy on a publicly-available server and change 127.0.0.1 to its address.