Question

In my code I use some Http Get request to download some files as a stream. I use the following code:

public String getClassName(String url) throws ClientProtocolException, IOException {
        HttpResponse response = sendGetRequestJsonText(url);

        Header[] all = response.getAllHeaders();
        for (Header h : all) {
            System.out.println(h.getName() + ": " + h.getValue());
        }

        Header[] headers = response.getHeaders("Content-Disposition");
        InputStreamParser.convertStreamToString(response.getEntity().getContent());
        String result = "";
        for (Header header : headers) {
            result = header.getValue();
        }
        return result.substring(result.indexOf("  ") + "  ".length(), result.length()).trim();
    }

但这下载了答复的全部内容。我只想找不到内容的负责人。 “欧洲复兴开发银行”的请求似乎不可行,因为当时我获得的地位为501,但没有得到执行。我如何能够这样做?

Answer 1

您可以不提出GET的要求,而只考虑提出HEAD。请求:

The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response. The metainformation contained in the HTTP headers in response to a HEAD request SHOULD be identical to the information sent in response to a GET request. This method can be used for obtaining metainformation about the entity implied by the request without transferring the entity-body itself. This method is often used for testing hypertext links for validity, accessibility, and recent modification.

Answer 2

You might be able to use the Range header in your request to specify a range of bytes to include in the response entity. Possibly something like:

Range: bytes=0-0

如果其工作,请在回复实体中填写<代码>Range的标书。然而,我没有尝试过这一点,也没有工作。

服务器MAY无视地圈头。

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