fix HTTP invalid host issue for channel not inited by http(s)

docs/cn/http_client.md

@@ -114,7 +114,7 @@ URL的一般形式如下图：
 
 若用户没有填且URL中包含host，比如http://www.foo.com/path，则http request中会包含"Host: www.foo.com"。
 
-若用户没有填且URL不包含host，比如"/index.html?name=value"，但如果Channel初始化的地址包含域名，则框架会以域名作为Host，比如"http://www.foo.com"，该http server将会看到"Host: www.foo.com"。如果地址是"http://www.foo.com:8989"，则该http server将会看到"Host: www.foo.com:8989"。
+若用户没有填且URL不包含host，比如"/index.html?name=value"，但如果Channel初始化的地址scheme为http(s)且包含域名，则框架会以域名作为Host，比如"http://www.foo.com"，该http server将会看到"Host: www.foo.com"。如果地址是"http://www.foo.com:8989"，则该http server将会看到"Host: www.foo.com:8989"。
 
 若用户没有填且URL不包含host，比如"/index.html?name=value"，如果Channel初始化的地址也不包含域名，则框架会以目标server的ip和port为Host，地址为10.46.188.39:8989的http server将会看到"Host: 10.46.188.39:8989"。
 

docs/en/http_client.md

@@ -115,7 +115,7 @@ If user already sets `Host` header(case insensitive), framework makes no change.
 
 If user does not set `Host` header and the URL has host, for example http://www.foo.com/path, the http request contains "Host: www.foo.com".
 
-If user does not set host header and the URL does not have host as well, for example "/index.html?name=value", but if the address initialized by the channel contains domain name. framework sets `Host` header with domain name of the target server. if this address is "http://www.foo.com", this http server should see `Host: www.foo.com`, if this address is "http://www.foo.com:8989", this http server should be see `Host: www.foo.com:8989`.
+If user does not set host header and the URL does not have host either, for example "/index.html?name=value", but if the channel is initlized by a http(s) address with valid domain name. framework sets `Host` header with domain name of the target server. if this address is "http://www.foo.com", this http server should see `Host: www.foo.com`, if this address is "http://www.foo.com:8989", this http server should be see `Host: www.foo.com:8989`.
 
 If user does not set host header and the URL does not have host as well, for example "/index.html?name=value", and the address initialized by the channel doesn't contain domain name. framework sets `Host` header with IP and port of the target server. A http server at 10.46.188.39:8989 should see `Host: 10.46.188.39:8989`.
 

src/brpc/channel.cpp

@@ -322,13 +322,12 @@ int Channel::InitSingle(const butil::EndPoint& server_addr_and_port,
     if (InitChannelOptions(options) != 0) {
         return -1;
     }
-    std::string scheme;
     int* port_out = raw_port == -1 ? &raw_port: NULL;
-    ParseURL(raw_server_address, &scheme, &_service_name, port_out);
+    ParseURL(raw_server_address, &_scheme, &_service_name, port_out);
     if (raw_port != -1) {
         _service_name.append(":").append(std::to_string(raw_port));
     }
-    if (_options.protocol == brpc::PROTOCOL_HTTP && scheme == "https") {
+    if (_options.protocol == brpc::PROTOCOL_HTTP && _scheme == "https") {
         if (_options.mutable_ssl_options()->sni_name.empty()) {
             _options.mutable_ssl_options()->sni_name = _service_name;
         }
@@ -363,13 +362,12 @@ int Channel::Init(const char* ns_url,
     if (InitChannelOptions(options) != 0) {
         return -1;
     }
-    std::string scheme;
     int raw_port = -1;
-    ParseURL(ns_url, &scheme, &_service_name, &raw_port);
+    ParseURL(ns_url, &_scheme, &_service_name, &raw_port);
     if (raw_port != -1) {
         _service_name.append(":").append(std::to_string(raw_port));
     }
-    if (_options.protocol == brpc::PROTOCOL_HTTP && scheme == "https") {
+    if (_options.protocol == brpc::PROTOCOL_HTTP && _scheme == "https") {
         if (_options.mutable_ssl_options()->sni_name.empty()) {
             _options.mutable_ssl_options()->sni_name = _service_name;
         }
@@ -429,7 +427,7 @@ void Channel::CallMethod(const google::protobuf::MethodDescriptor* method,
         CHECK(cntl->protocol_param().empty());
         cntl->protocol_param() = _options.protocol.param();
     }
-    if (_options.protocol == brpc::PROTOCOL_HTTP) {
+    if (_options.protocol == brpc::PROTOCOL_HTTP && (_scheme == "https" || _scheme == "http")) {
         URI& uri = cntl->http_request().uri();
         if (uri.host().empty() && !_service_name.empty()) {
             uri.SetHostAndPort(_service_name);

src/brpc/channel.h

@@ -221,6 +221,7 @@ friend class SelectiveChannel;
                    int raw_port = -1);
 
     std::string _service_name;
+    std::string _scheme;
     butil::EndPoint _server_address;
     SocketId _server_id;
     Protocol::SerializeRequest _serialize_request;