C# HttpClient Post returns 没有内容但是 Postman 有

Question

我正在尝试通过 POST 方法从 WebAPI 获取一些数据。 API 是一个 public 传输数据 API 并发送/接收 XML 序列化数据。当我从 Postman 调用 API 时，我得到了数据，当我尝试从 C# 执行相同操作时，尽管我收到了状态代码为 200 的消息，但 ContentLength 是 -1 并且我可以'从中读取任何数据。

我的 C# API 调用和流生成：

var stream = new MemoryStream();
serializer.Serialize(stream, toSend);

HttpClientHandler handler = new HttpClientHandler()
{
    AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
};
HttpClient client = new HttpClient(handler);

HttpResponseMessage response = await 
    client.PostAsync("https://api.opentransportdata.swiss/trias",
            new StringContent(new StreamReader(stream, 
                Encoding.UTF8).ReadToEnd(), Encoding.UTF8, "text/xml"));

我的 stream 是一个包含我的 XML 序列化数据的 MemoryStream。
响应消息是 200（好的）但是内容是空的，当我用 Postman 做同样的事情时它起作用了。
这是我发送的序列化 XML 数据，我从 Stream 中读取的数据与读取它的方式相同，将其发送到 API

<?xml version="1.0" encoding="utf-16"?>
<Trias xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" version="1.1" xmlns="http://www.vdv.de/trias">
  <ServiceRequest>
    <siri_x003A_RequestTimestamp>2018-10-09T10:31:56.2886025+02:00</siri_x003A_RequestTimestamp>
    <siri_x003A_RequestorRef>SEUS</siri_x003A_RequestorRef>
    <RequestPayload>
      <TripRequest>
        <Origin>
          <LocationRef>
            <StopPointRef>8500320</StopPointRef>
          </LocationRef>
        </Origin>
        <Destination>
          <LocationRef>
            <StopPointRef>8500322</StopPointRef>
          </LocationRef>
        </Destination>
      </TripRequest>
      <Params>
        <NumberOfResults>0</NumberOfResults>
        <IncludeTrackSections>false</IncludeTrackSections>
        <IncludeLegProjection>false</IncludeLegProjection>
        <IncludeIntermediateStops>false</IncludeIntermediateStops>
      </Params>
    </RequestPayload>
  </ServiceRequest>
</Trias>

这是预期的结果：

<?xml version="1.0" encoding="UTF-8"?>
<Trias xmlns="http://www.vdv.de/trias" version="1.1">
    <ServiceDelivery>
        <ResponseTimestamp xmlns="http://www.siri.org.uk/siri">2018-10-09T08:33:26Z</ResponseTimestamp>
        <ProducerRef xmlns="http://www.siri.org.uk/siri">EFAController10.2.9.62-WIN-G0NJHFUK71P</ProducerRef>
        <Status xmlns="http://www.siri.org.uk/siri">true</Status>
        <MoreData>false</MoreData>
        <Language>de</Language>
        <DeliveryPayload>
            <TripResponse>
                <TripResult>
                    <ResultId>ID-A24DE912-0263-4067-AD73-591DF01F4B05</ResultId>
                    <Trip>
                        <TripId>ID-E442EC5E-1B70-4E9D-836F-47585406D2F7</TripId>
                        <Duration>PT7M</Duration>
                        <StartTime>2018-10-09T08:19:00Z</StartTime>
                        <EndTime>2018-10-09T08:26:00Z</EndTime>
                        <Interchanges>0</Interchanges>
                        <TripLeg>
                            <LegId>1</LegId>
                            <TimedLeg>
                                <LegBoard>
                                    <StopPointRef>8500320</StopPointRef>
                                    <StopPointName>
                                        <Text>Stein-Säckingen</Text>
                                        <Language>de</Language>
                                    </StopPointName>
                                    <PlannedBay>
                                        <Text>2</Text>
                                        <Language>de</Language>
                                    </PlannedBay>
                                    <ServiceDeparture>
                                        <TimetabledTime>2018-10-09T08:19:00Z</TimetabledTime>
                                    </ServiceDeparture>
                                    <StopSeqNumber>1</StopSeqNumber>
                                </LegBoard>
                                <LegAlight>
                                    <StopPointRef>8500322</StopPointRef>
                                    <StopPointName>
                                        <Text>Laufenburg</Text>
                                        <Language>de</Language>
                                    </StopPointName>
                                    <PlannedBay>
                                        <Text>1</Text>
                                        <Language>de</Language>
                                    </PlannedBay>
                                    <ServiceArrival>
                                        <TimetabledTime>2018-10-09T08:26:00Z</TimetabledTime>
                                    </ServiceArrival>
                                    <StopSeqNumber>2</StopSeqNumber>
                                </LegAlight>
                                <Service>
                                    <OperatingDayRef>2018-10-09</OperatingDayRef>
                                    <JourneyRef>odp:04001::H:j18:17235:17235</JourneyRef>
                                    <LineRef>odp:04001::H</LineRef>
                                    <DirectionRef>outward</DirectionRef>
                                    <Mode>
                                        <PtMode>rail</PtMode>
                                        <RailSubmode>suburbanRailway</RailSubmode>
                                        <Name>
                                            <Text>S-Bahn</Text>
                                            <Language>de</Language>
                                        </Name>
                                    </Mode>
                                    <PublishedLineName>
                                        <Text>1</Text>
                                        <Language>de</Language>
                                    </PublishedLineName>
                                    <OperatorRef>odp:11</OperatorRef>
                                    <OriginText>
                                        <Text></Text>
                                        <Language>de</Language>
                                    </OriginText>
                                    <DestinationStopPointRef>8500322</DestinationStopPointRef>
                                    <DestinationText>
                                        <Text>Laufenburg</Text>
                                        <Language>de</Language>
                                    </DestinationText>
                                </Service>
                            </TimedLeg>
                        </TripLeg>
                    </Trip>
                </TripResult>
                <TripResult>
                    <ResultId>ID-CE13C278-DFBE-4AFF-8318-1E96EEE6FA9B</ResultId>
                    <Trip>
                        <TripId>ID-832873CC-4085-4131-9265-D5EF1F80DBF6</TripId>
                        <Duration>PT25M</Duration>
                        <StartTime>2018-10-09T08:35:00Z</StartTime>
                        <EndTime>2018-10-09T09:00:00Z</EndTime>
                        <Interchanges>0</Interchanges>
                        <TripLeg>
                            <LegId>1</LegId>
                            <InterchangeLeg>
                                <InterchangeMode>walk</InterchangeMode>
                                <LegStart>
                                    <StopPointRef>8500320</StopPointRef>
                                    <LocationName>
                                        <Text>Stein-Säckingen</Text>
                                        <Language>de</Language>
                                    </LocationName>
                                </LegStart>
                                <LegEnd>
                                    <StopPointRef>8572748</StopPointRef>
                                    <LocationName>
                                        <Text>Stein-Säckingen, Bahnhof</Text>
                                        <Language>de</Language>
                                    </LocationName>
                                </LegEnd>
                                <TimeWindowStart>2018-10-09T08:35:00Z</TimeWindowStart>
                                <TimeWindowEnd>2018-10-09T08:39:00Z</TimeWindowEnd>
                                <Duration>PT4M</Duration>
                            </InterchangeLeg>
                        </TripLeg>
                        <TripLeg>
                            <LegId>2</LegId>
                            <TimedLeg>
                                <LegBoard>
                                    <StopPointRef>8572748</StopPointRef>
                                    <StopPointName>
                                        <Text>Stein-Säckingen, Bahnhof</Text>
                                        <Language>de</Language>
                                    </StopPointName>
                                    <ServiceDeparture>
                                        <TimetabledTime>2018-10-09T08:39:00Z</TimetabledTime>
                                    </ServiceDeparture>
                                    <StopSeqNumber>1</StopSeqNumber>
                                </LegBoard>
                                <LegAlight>
                                    <StopPointRef>8572403</StopPointRef>
                                    <StopPointName>
                                        <Text>Laufenburg, Bahnhof</Text>
                                        <Language>de</Language>
                                    </StopPointName>
                                    <ServiceArrival>
                                        <TimetabledTime>2018-10-09T08:56:00Z</TimetabledTime>
                                    </ServiceArrival>
                                    <StopSeqNumber>10</StopSeqNumber>
                                </LegAlight>
                                <Service>
                                    <OperatingDayRef>2018-10-09</OperatingDayRef>
                                    <JourneyRef>odp:01143::R:j18:14332:14332</JourneyRef>
                                    <LineRef>odp:01143::R</LineRef>
                                    <DirectionRef>return</DirectionRef>
                                    <Mode>
                                        <PtMode>bus</PtMode>
                                        <BusSubmode>regionalBus</BusSubmode>
                                        <Name>
                                            <Text>Bus</Text>
                                            <Language>de</Language>
                                        </Name>
                                    </Mode>
                                    <PublishedLineName>
                                        <Text>143</Text>
                                        <Language>de</Language>
                                    </PublishedLineName>
                                    <OperatorRef>odp:801</OperatorRef>
                                    <Attribute>
                                        <Text>
                                            <Text>Linie 143: 1555</Text>
                                            <Language>de</Language>
                                        </Text>
                                        <Code>Y3933</Code>
                                        <Mandatory>false</Mandatory>
                                    </Attribute>
                                    <OriginText>
                                        <Text></Text>
                                        <Language>de</Language>
                                    </OriginText>
                                    <DestinationText>
                                        <Text>Laufenburg, Bahnhof                               &#xD;</Text>
                                        <Language>de</Language>
                                    </DestinationText>
                                </Service>
                            </TimedLeg>
                        </TripLeg>
                        <TripLeg>
                            <LegId>3</LegId>
                            <InterchangeLeg>
                                <InterchangeMode>walk</InterchangeMode>
                                <LegStart>
                                    <StopPointRef>8572403</StopPointRef>
                                    <LocationName>
                                        <Text>Laufenburg, Bahnhof</Text>
                                        <Language>de</Language>
                                    </LocationName>
                                </LegStart>
                                <LegEnd>
                                    <StopPointRef>8500322</StopPointRef>
                                    <LocationName>
                                        <Text>Laufenburg</Text>
                                        <Language>de</Language>
                                    </LocationName>
                                </LegEnd>
                                <TimeWindowStart>2018-10-09T08:56:00Z</TimeWindowStart>
                                <TimeWindowEnd>2018-10-09T09:00:00Z</TimeWindowEnd>
                                <Duration>PT4M</Duration>
                            </InterchangeLeg>
                        </TripLeg>
                    </Trip>
                </TripResult>
                <TripResult>
                    <ResultId>ID-7C9B4974-1D9D-4828-98BB-5A7022CD55B1</ResultId>
                    <Trip>
                        <TripId>ID-2FB9793D-93E8-495D-9802-0ECC6C4B98F3</TripId>
                        <Duration>PT6M</Duration>
                        <StartTime>2018-10-09T09:19:00Z</StartTime>
                        <EndTime>2018-10-09T09:25:00Z</EndTime>
                        <Interchanges>0</Interchanges>
                        <TripLeg>
                            <LegId>1</LegId>
                            <TimedLeg>
                                <LegBoard>
                                    <StopPointRef>8500320</StopPointRef>
                                    <StopPointName>
                                        <Text>Stein-Säckingen</Text>
                                        <Language>de</Language>
                                    </StopPointName>
                                    <PlannedBay>
                                        <Text>2</Text>
                                        <Language>de</Language>
                                    </PlannedBay>
                                    <ServiceDeparture>
                                        <TimetabledTime>2018-10-09T09:19:00Z</TimetabledTime>
                                        <EstimatedTime>2018-10-09T09:19:00Z</EstimatedTime>
                                    </ServiceDeparture>
                                    <StopSeqNumber>1</StopSeqNumber>
                                </LegBoard>
                                <LegAlight>
                                    <StopPointRef>8500322</StopPointRef>
                                    <StopPointName>
                                        <Text>Laufenburg</Text>
                                        <Language>de</Language>
                                    </StopPointName>
                                    <PlannedBay>
                                        <Text>1</Text>
                                        <Language>de</Language>
                                    </PlannedBay>
                                    <ServiceArrival>
                                        <TimetabledTime>2018-10-09T09:26:00Z</TimetabledTime>
                                        <EstimatedTime>2018-10-09T09:25:00Z</EstimatedTime>
                                    </ServiceArrival>
                                    <StopSeqNumber>2</StopSeqNumber>
                                </LegAlight>
                                <Service>
                                    <OperatingDayRef>2018-10-09</OperatingDayRef>
                                    <JourneyRef>odp:04001::H:j18:17239:17239</JourneyRef>
                                    <LineRef>odp:04001::H</LineRef>
                                    <DirectionRef>outward</DirectionRef>
                                    <Mode>
                                        <PtMode>rail</PtMode>
                                        <RailSubmode>suburbanRailway</RailSubmode>
                                        <Name>
                                            <Text>S-Bahn</Text>
                                            <Language>de</Language>
                                        </Name>
                                    </Mode>
                                    <PublishedLineName>
                                        <Text>1</Text>
                                        <Language>de</Language>
                                    </PublishedLineName>
                                    <OperatorRef>odp:11</OperatorRef>
                                    <OriginText>
                                        <Text></Text>
                                        <Language>de</Language>
                                    </OriginText>
                                    <DestinationStopPointRef>8500322</DestinationStopPointRef>
                                    <DestinationText>
                                        <Text>Laufenburg</Text>
                                        <Language>de</Language>
                                    </DestinationText>
                                </Service>
                            </TimedLeg>
                        </TripLeg>
                    </Trip>
                </TripResult>
            </TripResponse>
        </DeliveryPayload>
    </ServiceDelivery>
</Trias>

您可以自己尝试一下 here（只需将 "Template" 更改为 "TripRequest"）

Answer 1

我想通了。
在 client.PostAsync(...) 中，我告诉 API 我正在发布 Encoding.UTF8 编码数据，但我的序列化器正在生成 ibm850 编码数据

C# HttpClient Post returns 没有内容但是 Postman 有

C# HttpClient Post returns no content but Postman does

c#

xml

api

post

xml-serialization