我需要这里描述的apache超文本传输协议5客户端示例的帮助。我的目标是做与CURL完全相同的事情：

curl --verbose --user "admin:admin" --data-binary @20200802112010-test.csv  'http://localhost:8080/api/test/write?db=test' --trace-ascii trace.txt

我修改了示例以执行POST而不是GET：

private void _sendFile(File file) throws IOException, URISyntaxException {
        BasicScheme basicScheme = new BasicScheme();

        basicScheme.initPreemptive(new UsernamePasswordCredentials("admin", "admin".toCharArray()));

        HttpClientContext httpClientContext = HttpClientContext.create();

        HttpHost httpHost = new HttpHost("http", "localhost", 8080);

        httpClientContext.resetAuthExchange(httpHost, basicScheme);

        try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
            FileEntity fileEntity = new FileEntity(file, ContentType.APPLICATION_FORM_URLENCODED);

            HttpPost httpPost = new HttpPost("http://localhost:8080/api/test/write?db=test");

            httpPost.setEntity(fileEntity);

            try (final CloseableHttpResponse httpResponse = httpClient.execute(httpHost, httpPost, httpClientContext)) {
                if (httpResponse.getCode() == 204) {
                    return;
                }

                _logger.warn("Unexpected return code {}", httpResponse.getCode());
            }
        }
    }

我的服务器端代码是JHipster生成的Spring Boot App，处理请求的控制器是这样的：

@Profile({"dev", "igor"})
@RequestMapping("/api/test")
@RestController
public class DBEndpointSimulatorResource {

    /**
     * {@code POST  /write} : Simulates file import on INRAE InfluxDB server.
     *
     * @param dataBase the database name
     * @param content the request body
     *
     * @return the {@link ResponseEntity} with status {@code 204 (No Content)}
     * @throws URISyntaxException if the Location URI syntax is incorrect.
     */
    @PostMapping("/write")
    public ResponseEntity<?> simulateWrite(@RequestParam("db") String dataBase, @RequestBody String content)
        throws URISyntaxException {

        _logger.debug("REST request to process file for: {}", dataBase);

        if (content == null) {
            throw new BadRequestAlertException(
                "A content must not be empty", "DB FILE", "ERROR-SIMULATOR-001");
        }

        final ResponseEntity.HeadersBuilder<?> headersBuilder = ResponseEntity.noContent();

        return headersBuilder.build();
    }

    private final Logger _logger = LoggerFactory.getLogger(DBEndpointSimulatorResource.class);

}

一旦执行_sendFile代码收到HTTP错误404。我打开了httpclient 5的日志记录，它会退出正确连接到服务器端的响应404：

     ex-00000032: target auth state: UNCHALLENGED
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] o.a.h.c.http.impl.classic.ProtocolExec   : ex-00000032: proxy auth state: UNCHALLENGED
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] o.a.h.c.http.impl.classic.ConnectExec    : ex-00000032: acquiring connection with route {}->http://localhost:8080
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] o.a.h.c.h.i.classic.InternalHttpClient   : ex-00000032: acquiring endpoint (3 MINUTES)
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] h.i.i.PoolingHttpClientConnectionManager : ex-00000032: endpoint lease request (3 MINUTES) [route: {}->http://localhost:8080][total available: 0; route allocated: 0 of 5; total allocated: 0 of 25]
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] h.i.i.PoolingHttpClientConnectionManager : ex-00000032: endpoint leased [route: {}->http://localhost:8080][total available: 0; route allocated: 1 of 5; total allocated: 1 of 25]
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] h.i.i.PoolingHttpClientConnectionManager : ex-00000032: acquired ep-00000031
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] o.a.h.c.h.i.classic.InternalHttpClient   : ex-00000032: acquired endpoint ep-00000031
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] o.a.h.c.http.impl.classic.ConnectExec    : ex-00000032: opening connection {}->http://localhost:8080
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] o.a.h.c.h.i.classic.InternalHttpClient   : ep-00000031: connecting endpoint (3 MINUTES)
2020-08-03 10:01:00.009 DEBUG 95767 --- [ta-scheduling-2] h.i.i.PoolingHttpClientConnectionManager : ep-00000031: connecting endpoint to http://localhost:8080 (3 MINUTES)
2020-08-03 10:01:00.010 DEBUG 95767 --- [ta-scheduling-2] .i.i.DefaultHttpClientConnectionOperator : http-outgoing-49: connecting to localhost/127.0.0.1:8080
2020-08-03 10:01:00.010 DEBUG 95767 --- [ta-scheduling-2] .i.i.DefaultHttpClientConnectionOperator : http-outgoing-49: connection established 127.0.0.1:52473<->127.0.0.1:8080
2020-08-03 10:01:00.010 DEBUG 95767 --- [ta-scheduling-2] h.i.i.PoolingHttpClientConnectionManager : ep-00000031: connected http-outgoing-49
2020-08-03 10:01:00.010 DEBUG 95767 --- [ta-scheduling-2] o.a.h.c.h.i.classic.InternalHttpClient   : ep-00000031: endpoint connected
2020-08-03 10:01:00.010 DEBUG 95767 --- [ta-scheduling-2] o.a.h.c.h.impl.classic.MainClientExec    : ex-00000032: executing POST /api/test/write?db=test HTTP/1.1
2020-08-03 10:01:00.010 DEBUG 95767 --- [ta-scheduling-2] o.a.h.c.h.i.classic.InternalHttpClient   : ep-00000031: start execution ex-00000032
2020-08-03 10:01:00.010 DEBUG 95767 --- [ta-scheduling-2] h.i.i.PoolingHttpClientConnectionManager : ep-00000031: executing exchange ex-00000032 over http-outgoing-49
2020-08-03 10:01:00.010 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.headers       : http-outgoing-49 >> POST /api/test/write?db=test HTTP/1.1
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.headers       : http-outgoing-49 >> Accept-Encoding: gzip, x-gzip, deflate
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.headers       : http-outgoing-49 >> Content-Length: 29423
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.headers       : http-outgoing-49 >> Content-Type: application/x-www-form-urlencoded; charset=ISO-8859-1
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.headers       : http-outgoing-49 >> Host: localhost:8080
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.headers       : http-outgoing-49 >> Connection: keep-alive
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.headers       : http-outgoing-49 >> User-Agent: Apache-HttpClient/5.0 (Java/1.8.0_202)
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.headers       : http-outgoing-49 >> Authorization: Basic YWRtaW46YWRtaW4=
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "POST /api/test/write?db=test HTTP/1.1[\r][\n]"
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "Accept-Encoding: gzip, x-gzip, deflate[\r][\n]"
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "Content-Length: 29423[\r][\n]"
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "Content-Type: application/x-www-form-urlencoded; charset=ISO-8859-1[\r][\n]"
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "Host: localhost:8080[\r][\n]"
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "Connection: keep-alive[\r][\n]"
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "User-Agent: Apache-HttpClient/5.0 (Java/1.8.0_202)[\r][\n]"
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "Authorization: Basic YWRtaW46YWRtaW4=[\r][\n]"
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "[\r][\n]"
2020-08-03 10:01:00.011 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "pesmic,dat1=MIC,dat2=2136-0000 dat3="null",dat4=60,dat5=0,dat6=0,dat7=0,activ="null" 1554026400000000000[\n]"
2020-08-03 10:01:00.034 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 >> "pesmic,dat1=MIC,dat2=2136-0001 dat3="null",dat4=40060,dat5=0,dat6=0,dat7=0,activ="null" 1554530400000000000"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "HTTP/1.1 404 [\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "X-Content-Type-Options: nosniff[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "X-Frame-Options: SAMEORIGIN[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "X-XSS-Protection: 1[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "Set-Cookie: JSESSIONID=AEC03A81AD4A85F68CB94BAF23E784E8; Path=/; HttpOnly[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "Content-Type: text/html;charset=UTF-8[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "Content-Length: 690[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "Date: Mon, 03 Aug 2020 08:01:00 GMT[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "Keep-Alive: timeout=20[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "Connection: keep-alive[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "[\r][\n]"
2020-08-03 10:01:00.037 DEBUG 95767 --- [ta-scheduling-2] org.apache.hc.client5.http.wire          : http-outgoing-49 << "[\n]"

一开始我认为Spring启动端的控制器是错误的，但我用cURL尝试了相同的请求，它以成功告终：

    => Send header, 236 bytes (0xec)
0000: POST /api/test/write?db=test HTTP/1.1
0027: Host: localhost:8080
003d: Authorization: Basic YWRtaW46YWRtaW4=
0064: User-Agent: curl/7.64.1
007d: Accept: */*
008a: Content-Length: 2689786
00a3: Content-Type: application/x-www-form-urlencoded
00d4: Expect: 100-continue
00ea: 
<= Recv header, 23 bytes (0x17)
0000: HTTP/1.1 100 Continue
<= Recv header, 19 bytes (0x13)
0000: Content-Length: 0
=> Send data, 65536 bytes (0x10000)
== Info: We are completely uploaded and fine
<= Recv header, 25 bytes (0x19)
0000: HTTP/1.1 204 No Content
<= Recv header, 12 bytes (0xc)
0000: Expires: 0

我看到apache超文本传输协议客户端附加字符编码的内容类型不同。现在我想知道：

1. 我应该强制utf8字符编码吗？？或
2. 我的apache httpclient帖子示例中还有其他错误