内容长度为空的EntityTemplate [英] Content-length is null for EntityTemplate
问题描述
适用范围:包含在Android的我使用Apache的HTTP库和尝试通过HttpClient的使用HttpEntity,从EntityTemplate与ContentProducer作出执行HttpPost。
这里的的code
Scope: I'm using http apache libraries included in Android and trying to execute HttpPost via HttpClient with HttpEntity, made from EntityTemplate with ContentProducer. Here is the code:
HttpClient httpClient = new CustomHttpsClient().getNewHttpClient();
HttpPost httpPost = new HttpPost("APP_URI");
HttpEntity postEntity;
HttpEntity getEntity;
ContentProducer contentProducer = new ContentProducer() {
@Override
public void writeTo(OutputStream outstream) throws IOException {
// TODO Auto-generated method stub
Writer writer = new OutputStreamWriter(outstream, "UTF-8");
writer.write("<req version=\"1.0\" lang=\"RU\">");
writer.write("<act>o_addcard</act>");
writer.write("</req>");
writer.flush();
}
};
postEntity = new EntityTemplate(contentProducer);
httpPost.setEntity(postEntity);
String responseEntity;
try {
HttpResponse httpResponse = httpClient.execute(httpPost);
...} catch(...){...}
问题:服务器总是给我411响应code(内容长度为空):
Problem: Server always gives me 411 response code (Content-length is null):
POST / HTTP / 1.1411 180 - -
"POST / HTTP/1.1" 411 180 "-" "-"
这些code工作在某些服务器上。但是,为什么内容长度总是空?
同时,我们也不能手动设置,否则我们都异常产生的原因:
These code works on some servers. But why content-length is always null? Also we can't set it manually, otherwise we have exception Caused by:
产生的原因:org.apache.http.ProtocolException:Content-Length头已经present
Caused by: org.apache.http.ProtocolException: Content-Length header already present
您的回答非常感谢!
推荐答案
我曾与实体模板相同的问题,因为它不是为一些例如测量内容长度。
I had the same issue with Entity template, as it is content Length was not measured for some instance.
有两种可能的解决方法对我来说:
There are two possible workarounds for me:
1)重写EntityTemplate
1) Overriding EntityTemplate
class EntityTemplateSpike extends EntityTemplate{
public EntityTemplateSpike(ContentProducer contentproducer) {
super(contentproducer);
}
@Override
public long getContentLength() {
return // Paste here your ContentLength value
}
}
postEntity = new EntityTemplateSpike(contentProducer);
2)错误是由非标准请求拦截RequestContent引起的。你可以将其覆盖
2) Error is caused by standart Request interceptor RequestContent. You can override it
// This class is a copy of standart RequestContent class except for Exception
// is not being thrown if ContentLegth is already set.
private class RequestContentSpike implements HttpRequestInterceptor{
public RequestContentSpike() {
super();
}
public void process(final HttpRequest request, final HttpContext context) throws HttpException, IOException {
if (request == null) {
throw new IllegalArgumentException("HTTP request may not be null");
}
if (request instanceof HttpEntityEnclosingRequest) {
if (request.containsHeader(HTTP.TRANSFER_ENCODING)) {
throw new ProtocolException("Transfer-encoding header already present");
}
ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
if (entity == null) {
request.addHeader(HTTP.CONTENT_LEN, "0");
return;
}
if (entity.isChunked() || entity.getContentLength() < 0) {
if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
throw new ProtocolException( "Chunked transfer encoding not allowed for " + ver);
}
request.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING);
} else {
request.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength()));
}
if (entity.getContentType() != null && !request.containsHeader(HTTP.CONTENT_TYPE )) {
request.addHeader(entity.getContentType());
}
if (entity.getContentEncoding() != null && !request.containsHeader(HTTP.CONTENT_ENCODING)) {
request.addHeader(entity.getContentEncoding());
}
}
}
}
((CustomHttpsClient)mClient).removeRequestInterceptorByClass(RequestContent.class);
((CustomHttpsClient)mClient).addRequestInterceptor(new RequestContentSpike());
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