get请求中的零Content-Length从lighttpd获取400错误请求(clj-http)

Question

在执行get请求时，会自动包含Content-Length报头并将其设置为零。是否可以删除上述标头，或者默认情况下使库不包含它？

Answer 1

如果我尝试：

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

我得到了：

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>}   

这将产生一个400错误。我尝试用Java语言直接使用Apache HttpClient重现它：

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);
  }
}

但是，这可以很好地工作。我的猜测是，在调用HttpClient之前，clj-http正在做一些强制在响应中使用空体的操作，因此HttpClient将头部Content-Length设置为0。如果你看一下源代码，就会发现这个头不是由clj-http设置的。我会把这个作为一个问题提交给clj-http。

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