英文:
Reactor httpclient sendForm with Content-Length
问题
我正在学习 reactor-netty 作为 HTTP 客户端来发送多部分表单数据。我的服务器需要 Content-Length 字段，但似乎 reactor-netty 不会自动设置它（有趣的是它在每个部分中设置了 Content-Length，这并不满足我的服务器的要求）。
与 http apache 客户端中的 CloseableHttpClient 相比，Http 流量（错误）如下所示：
POST /post HTTP/1.1
user-agent: ReactorNetty/1.1.4
host: myservername
accept: */*
content-type: application/json
content-type: multipart/form-data; boundary=40e3ae2412eea9a2
transfer-encoding: chunked
--40e3ae2412eea9a2
content-disposition: form-data; name="a"
content-length: 94
content-type: application/json
content-transfer-encoding: binary
dataa...
--40e3ae2412eea9a2
content-disposition: form-data; name="b"
content-length: 205
content-type: application/json
content-transfer-encoding: binary
datab...
--40e3ae2412eea9a2--
与之相比，http apache 客户端中的 CloseableHttpClient 的 Http 流量（正确）如下：
POST /post HTTP/1.1
Accept-Encoding: gzip, x-gzip, deflate
Content-Length: 611
Content-Type: multipart/form-data; charset=ISO-8859-1; boundary=dbiD5AN62qhyG8C8HAbOPu5zlltTOSu2q
Host: myservername
Connection: keep-alive
User-Agent: Apache-HttpClient/5.2.1 (Java/11.0.12)
--dbiD5AN62qhyG8C8HAbOPu5zlltTOSu2q
Content-Disposition: form-data; name="a"
Content-Type: application/json; charset=UTF-8
dataa...
--dbiD5AN62qhyG8C8HAbOPu5zlltTOSu2q
Content-Disposition: form-data; name="b"
Content-Type: application/json; charset=UTF-8
datab...
--dbiD5AN62qhyG8C8HAbOPu5zlltTOSu2q--
请问有人可以告诉我如何设置 Content-Length？最好是自动设置。我正在使用 jdk11 和 reactor-netty 1.1.4。
英文:
I'm learning reactor-netty as http client to send multi form data.
My Server requires Content-Length field but seems reactor-netty doesn't set it automatically.(Interestingly it sets Content-Length in each part, which doesn't satisfy my server)
HttpClient.create().port(server.port()).post().uri("/postpath")
.sendForm((req, form) -> form
.multipart(true)
.file("a", new ByteArrayInputStream(jsona.getBytes(StandardCharsets.UTF_8)), "application/json")
.file("b", new ByteArrayInputStream(jsonb.getBytes(StandardCharsets.UTF_8)), "application/json")
)
//...omitted, same as the github examples
- Http traffic(wrong)
Http traffic is like following:
POST /post HTTP/1.1
user-agent: ReactorNetty/1.1.4
host: myservernmae
accept: */*
content-type: application/json
content-type: multipart/form-data; boundary=40e3ae2412eea9a2
transfer-encoding: chunked
--40e3ae2412eea9a2
content-disposition: form-data; name="a"
content-length: 94
content-type: application/json
content-transfer-encoding: binary
dataa...
--40e3ae2412eea9a2
content-disposition: form-data; name="b"
content-length: 205
content-type: application/json
content-transfer-encoding: binary
datab...
--40e3ae2412eea9a2--
Compared to CloseableHttpClient in http apache client
final HttpPost httppost = new HttpPost("http://myservernmae/postpath");
final HttpEntity reqEntity = MultipartEntityBuilder.create()
.addPart("a", aBody)
.addPart("b", bBody)
.build();
httppost.setEntity(reqEntity);
final CloseableHttpClient httpclient = HttpClients.createDefault();
httpclient.execute(httppost, response -> {
// omit remaining
- http traffic(correct)
POST /post HTTP/1.1
Accept-Encoding: gzip, x-gzip, deflate
Content-Length: 611
Content-Type: multipart/form-data; charset=ISO-8859-1; boundary=dbiD5AN62qhyG8C8HAbOPu5zlltTOSu2q
Host: myservernmae
Connection: keep-alive
User-Agent: Apache-HttpClient/5.2.1 (Java/11.0.12)
--dbiD5AN62qhyG8C8HAbOPu5zlltTOSu2q
Content-Disposition: form-data; name="a"
Content-Type: application/json; charset=UTF-8
dataa...
--dbiD5AN62qhyG8C8HAbOPu5zlltTOSu2q
Content-Disposition: form-data; name="b"
Content-Type: application/json; charset=UTF-8
datab...
--dbiD5AN62qhyG8C8HAbOPu5zlltTOSu2q--
Could anyone tell me how to set the Content-Length? better automatically. I'm using jdk11, reactor-netty 1.1.4.
答案1
得分: 1
默认情况下，Reactor Netty 添加了 Transfer-Encoding: chunked。只需在组合请求之前删除此标头，Reactor Netty 将添加 Content-Length，其值是所有部分长度的总和。请参考下面的修改示例：
HttpClient.create().port(server.port()).post().uri("/postpath")
.sendForm((req, form) -> {
req.requestHeaders().remove(HttpHeaderNames.TRANSFER_ENCODING);
form.multipart(true)
.file("a", new ByteArrayInputStream(jsona.getBytes(StandardCharsets.UTF_8)), "application/json")
.file("b", new ByteArrayInputStream(jsonb.getBytes(StandardCharsets.UTF_8)), "application/json")
})
//...omitted, same as the github examples
英文:
By default, Reactor Netty adds Transfer-Encoding: chunked. Just remove this header before composing your request and Reactor Netty will add Content-Length with a value summing the lengths of all parts. See below the modified example:
HttpClient.create().port(server.port()).post().uri("/postpath")
.sendForm((req, form) -> {
req.requestHeaders().remove(HttpHeaderNames.TRANSFER_ENCODING);
form.multipart(true)
.file("a", new ByteArrayInputStream(jsona.getBytes(StandardCharsets.UTF_8)), "application/json")
.file("b", new ByteArrayInputStream(jsonb.getBytes(StandardCharsets.UTF_8)), "application/json")
})
//...omitted, same as the github examples
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