get请求中的Zero Content Length从lighttpd(clj-http)获取400 Bad reque

Question

使用Clojure 1.4(Java 7)和cljhttp(0.6.0)库。执行获取请求时，内容长度标头会自动包含并设置为零。有些服务器(例如lighttpd)不喜欢这样，并使用Bad Request进行响应。是否可以删除所述标头或使库默认不包含该标头？我在文档中找不到任何相关的东西，谷歌搜索只给了我这个，这并没有真正的帮助。

Answer 1

如果我尝试：

(client/get "http://thepiratebay.se" {:debug true})

我得到：

Request: nil
{:scheme :http,
:http-url "http://thepiratebay.se",
:request-method :get,
:query-string nil,
:uri "",
:server-name "thepiratebay.se",
:headers {"accept-encoding" "gzip, deflate"},
:debug true,
:body-type nil,
:server-port nil,
:body nil,
:user-info nil}
HttpRequest:
{:requestLine #<BasicRequestLine GET http://thepiratebay.se HTTP/1.1>,
:protocolVersion #<HttpVersion HTTP/1.1>,
:params
#<BasicHttpParams org.apache.http.params.BasicHttpParams@5b14a306>,
:method "GET",
:entity nil,
:class
clj_http.core.proxy$org.apache.http.client.methods.HttpEntityEnclosingRequestBase$0,
:allHeaders
[#<BasicHeader Connection: close>,
#<BasicHeader accept-encoding: gzip, deflate>],
:aborted false,
:URI #<URI http://thepiratebay.se>}   

这会产生一个400的错误。我尝试在Java中直接使用ApacheHttpClient来复制它：

import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.client.HttpClient;
import org.apache.http.HttpResponse;
import org.apache.http.Header;
public class Get {
public static void main(String args[]) throws Exception {
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(args[0]);
httpget.addHeader("Connection", "close");
httpget.addHeader("accept-encoding", "gzip, deflate");
Header[] headers = httpget.getAllHeaders();
for (Header h : headers) {
System.out.println(h.getName() + ", " + h.getValue());
}
System.out.println();
HttpResponse response = httpclient.execute(httpget);
System.out.println(response);
}
}

然而，这很好用。我的猜测是，在调用HttpClient之前，cljhttp正在做一些事情，强制在响应中使用一个空正文，因此HttpClient将标头Content-Length设置为0。如果查看源代码，则cljhttp不会设置标头。我会将此作为cljhttp的问题提交。

https://github.com/dakrone/clj-http/issues