Network programming WebRequest.GetResponse（）正在获取一个“"；“基础连接已关闭”；

我构建WebRequest对象，然后对其调用GetResponse（）。url为“$metadata”

它会出现在浏览器中。真正奇怪的是，它们返回的是200，所以应该是好的。但没有数据回来

根据Fiddler的说法，有两个要求：

请求#1

A SSLv3-compatible ClientHello handshake was found. Fiddler extracted the parameters below.

Version: 3.1 (TLS/1.0)
Random: 5E 5B 1A 26 84 02 5A 4B DF 6B BF 22 DF 2C 03 AD 37 62 DA CE 05 79 7E B4 5C 58 AF BE 8C 26 5D CA
"Time": 4/4/1990 2:38:54 PM
SessionID: empty
Extensions: 
    server_name services.odata.org
    supported_groups    x25519 [0x1d], secp256r1 [0x17], secp384r1 [0x18]
    ec_point_formats    uncompressed [0x0]
    SessionTicket   empty
    extended_master_secret  empty
    renegotiation_info  00
Ciphers: 
    [C00A]  TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
    [C009]  TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
    [C014]  TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
    [C013]  TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
    [0035]  TLS_RSA_WITH_AES_256_CBC_SHA
    [002F]  TLS_RSA_WITH_AES_128_CBC_SHA
    [000A]  SSL_RSA_WITH_3DES_EDE_SHA

Compression: 
    [00]    NO_COMPRESSION

响应#1

A SSLv3-compatible ClientHello handshake was found. Fiddler extracted the parameters below.

Version: 3.1 (TLS/1.0)
Random: 5E 5B 1A 26 84 02 5A 4B DF 6B BF 22 DF 2C 03 AD 37 62 DA CE 05 79 7E B4 5C 58 AF BE 8C 26 5D CA
"Time": 4/4/1990 2:38:54 PM
SessionID: empty
Extensions: 
    server_name services.odata.org
    supported_groups    x25519 [0x1d], secp256r1 [0x17], secp384r1 [0x18]
    ec_point_formats    uncompressed [0x0]
    SessionTicket   empty
    extended_master_secret  empty
    renegotiation_info  00
Ciphers: 
    [C00A]  TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
    [C009]  TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
    [C014]  TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
    [C013]  TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
    [0035]  TLS_RSA_WITH_AES_256_CBC_SHA
    [002F]  TLS_RSA_WITH_AES_128_CBC_SHA
    [000A]  SSL_RSA_WITH_3DES_EDE_SHA

Compression: 
    [00]    NO_COMPRESSION

请求#2

A SSLv3-compatible ClientHello handshake was found. Fiddler extracted the parameters below.

Version: 3.1 (TLS/1.0)
Random: 5E 5B 1A 26 0D B0 9F BF 4F D8 FC 5D 27 47 A8 7C CB 83 2C 43 4C 2B C3 8A 0C C0 EB 30 3D 6E AB 51
"Time": 4/4/1990 2:38:54 PM
SessionID: empty
Extensions: 
    server_name services.odata.org
    supported_groups    x25519 [0x1d], secp256r1 [0x17], secp384r1 [0x18]
    ec_point_formats    uncompressed [0x0]
    SessionTicket   empty
    extended_master_secret  empty
    renegotiation_info  00
Ciphers: 
    [C00A]  TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
    [C009]  TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
    [C014]  TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
    [C013]  TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
    [0035]  TLS_RSA_WITH_AES_256_CBC_SHA
    [002F]  TLS_RSA_WITH_AES_128_CBC_SHA
    [000A]  SSL_RSA_WITH_3DES_EDE_SHA

Compression: 
    [00]    NO_COMPRESSION

响应#2

A SSLv3-compatible ClientHello handshake was found. Fiddler extracted the parameters below.

Version: 3.1 (TLS/1.0)
Random: 5E 5B 1A 26 0D B0 9F BF 4F D8 FC 5D 27 47 A8 7C CB 83 2C 43 4C 2B C3 8A 0C C0 EB 30 3D 6E AB 51
"Time": 4/4/1990 2:38:54 PM
SessionID: empty
Extensions: 
    server_name services.odata.org
    supported_groups    x25519 [0x1d], secp256r1 [0x17], secp384r1 [0x18]
    ec_point_formats    uncompressed [0x0]
    SessionTicket   empty
    extended_master_secret  empty
    renegotiation_info  00
Ciphers: 
    [C00A]  TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
    [C009]  TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
    [C014]  TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
    [C013]  TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
    [0035]  TLS_RSA_WITH_AES_256_CBC_SHA
    [002F]  TLS_RSA_WITH_AES_128_CBC_SHA
    [000A]  SSL_RSA_WITH_3DES_EDE_SHA

Compression: 
    [00]    NO_COMPRESSION

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这是TLS级别。只需添加：

ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;