PUT请求发出400错误请求错误

Question

我正在使用谷歌联系人API实现一个联系人应用程序。现在，我正试图通过发送以下格式的put请求来更新联系人

PUT /m8/feeds/contacts/default/full/{contactId}
If-Match: {lastKnownEtag}
GData-Version: 3.0
Content-Type: application/atom+xml

我将XML作为字符串发送，作为请求的主体。这是我的xmlString（请求主体）

<?xml version="1.0" encoding="UTF-8"?>
<entry xmlns:gd="http://schemas.google.com/g/2005" gd:etag="*">
<id>http://www.google.com/m8/feeds/contacts/default/base/1785xxxx</id>
<catagory scheme="http://schemas.google.com/g/2005#kind" term="http://schemas.google.com/contact/2008#contact"/>
<gd:name>
<gd:fullname>abc</gd:fullname></gd:name>
<gd:email address="[e-mail]" displayName="abc" primary="true" rel="http://schemas.google.com/g/2005#work"/>
<content type="text">Notes</content>
<gd:phoneNumber primary="true" rel="http://schemas.google.com/g/2005#other">9090xxxxxx</gd:phoneNumber>
</entry>

我写了下面的代码来发送更新联系人的PUT请求。

    String getUrl = "https://www.google.com/m8/feeds/contacts/default/full/"+contactID+"?oauth_token=" + accessToken;         
    URL url = new URL(getUrl);
    HttpURLConnection con = (HttpURLConnection) url.openConnection();        
    con.setDoOutput(true);          
    con.setRequestMethod("PUT");
    con.setRequestProperty("Content-Type", "application/atom+xml" );
    con.setRequestProperty("GData-Version","3.0"); 
    con.setRequestProperty("IF-MATCH", "*");
    OutputStreamWriter output = new OutputStreamWriter(con.getOutputStream());      
    output.write(xmlString);   
    // xmlString is the body of the request
    output.flush();
    output.close();
    System.out.println(con.getResponseCode());

当我试图在OAuth 2.0 Playground中发送请求时，联系人更新成功。但是当我试图运行上面的程序时，我得到了

400错误请求错误

我不知道我哪里出错了。任何帮助都将不胜感激！

Answer 1

我终于找到了我的错误所在。

我的xmlString无效。

有效的XML字符串

<?xml version="1.0" encoding="UTF-8"?>
<entry xmlns:gd="http://schemas.google.com/g/2005" gd:etag="*" xmlns="http://www.w3.org/2005/Atom">
    <id>http://www.google.com/m8/feeds/contacts/default/base/1785xxxx </id>
    <category scheme="http://schemas.google.com/g/2005#kind" term="http://schemas.google.com/contact/2008#contact" />
    <gd:name>
        <gd:fullName>name</gd:fullName>
    </gd:name>
    <gd:email address="[e-mail]" displayName="juli" primary="true" rel="http://schemas.google.com/g/2005#work" />
    <content type="text">Notes</content>
    <gd:phoneNumber primary="true" rel="http://schemas.google.com/g/2005#other">9090xxxxxx</gd:phoneNumber>
</entry>