[Developers] Java and mql write service

[Ben Drees]

Hi Christian,

The HTTP error response bodies usually provide clues as to what's going on.

It looks like you're getting back response bodies that include the message
"one of query=, or queries= must be provided", which points to a missing 
"queries="
prefix in your 'envelope' variable.

-Ben

Dae Park wrote:
> Do you have the message detail (JSON response) of the 400 response  
> you are getting?
>
> Make sure you are doing a POST and your post parameter looks like:
>
> queries={'qname':{'query':{...}}}
>
> -dae
>
> On Feb 18, 2008, at 7:07 PM, Christian Hirsch wrote:
>
>   
>> Hi All,
>>
>> I am trying to access the write API using Java, but somehow I  
>> always get an error.
>> Sending read and login requests works just fine, however when I'm  
>> sending write requests I'm always getting '400 bad request'. I'm  
>> not very familiar with http requests in java... could there be  
>> something wrong with the request header? or the credentials? -  
>> maybe someone has some working example code?
>>
>> this is the code I'm using:
>>
>> query = "{\"create\":\"unless_exists\",\"id\":null,\"type\":\"/ 
>> common/topic\", \"name\":\"test_xy\"}";
>> String envelope = "{\"qname\":{\"query\":" +query+ "}}";
>> String data = URLEncoder.encode(envelope, "UTF-8");
>>
>> URL url = new URL("http://sandbox.freebase.com/api/service/mqlwrite");
>> URLConnection conn = url.openConnection();
>> conn.setDoInput(true);
>> conn.setDoOutput(true);
>>
>> String credentials = "metaweb-user=..."; // value of the Set-Cookie  
>> from the login response
>> conn.setRequestProperty("Cookie", credentials);
>> conn.setRequestProperty("X-Metaweb-Request", "True");
>> conn.setRequestProperty("Content-type", "application/x-www-form- 
>> urlencoded");
>>
>> OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream 
>> ());
>> wr.write(data);
>> wr.flush();
>>
>> BufferedReader rd = new BufferedReader(new InputStreamReader 
>> (conn.getInputStream()));
>> //write the response to a JSON object...
>> wr.close();
>> rd.close();
>>
>>
>> Thanks,
>> Christian
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>>     
>
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