#include <userver/server/component.hpp>
Component that listens for incoming requests, manages incoming connections and passes the requests to the appropriate handler.
Starts listening and accepting connections only after all the components are loaded.
All the classes inherited from server::handlers::HttpHandlerBase and registered in components list bind to the components::Server component.
| Name | Description | Default value |
|---|---|---|
| logger_access | set to logger name from components::Logging component to write access logs into it; do not set to avoid writing access logs | - |
| logger_access_tskv | set to logger name from components::Logging component to write access logs in TSKV format into it; do not set to avoid writing access logs | - |
| max_response_size_in_flight | set it to the size of response in bytes and the component will drop bigger responses from handlers that allow throttling | - |
| server-name | value to send in HTTP Server header | value from utils::GetUserverIdentifier() |
| listener | (required) see below | - |
| listener-monitor | see below | - |
| set-response-server-hostname | set to true to add the X-YaTaxi-Server-Hostname header with instance name, set to false to not add the header | false |
Server is configured by 'listener' and 'listener-monitor' entries. 'listener' is a required entry that describes the request processing socket. 'listener-monitor' is an optional entry that describes the special monitoring socket, used for getting statistics and processing utility requests that should succeed even is the main socket is under heavy pressure.
Each of the 'listener' and 'listener-monitor' may be configured with the following options:
| Name | Description | Default value |
|---|---|---|
| address | IPv6 or IPv4 network interface to bind to | '::' (all the IPv6 and IPv4 local interfaces) |
| port | port to listen on | 0 |
| unix-socket | unix socket to listen on instead of listening on a port and network address | '' |
| max_connections | max connections count to keep | 32768 |
| task_processor | task processor to process incoming requests | - |
| backlog | max count of new connections pending acceptance | 1024 |
| tls.ca | paths to TLS CAs for client authentication | - |
| tls.cert | path to TLS server certificate | - |
| tls.private-key | path to TLS server certificate private key | - |
| tls.private-key-passphrase-name | passphrase name located in secdist's "passphrases" section | - |
| handler-defaults.max_url_size | max path/URL size or empty to not limit | 8192 |
| handler-defaults.max_request_size | max size of the whole request | 1024 * 1024 |
| handler-defaults.max_headers_size | max request headers size | 65536 |
| handler-defaults.parse_args_from_body | optional field to parse request according to x-www-form-urlencoded rules and make parameters accessible as query parameters | false |
| handler-defaults.set_tracing_headers | whether to set http tracing headers (X-YaTraceId, X-YaSpanId, X-RequestId) | true |
| handler-defaults.deadline_propagation_enabled | when false, disables HTTP handler deadline propagation | true |
| handler-defaults.deadline_expired_status_code | the HTTP status code to return if the request deadline expires | 498 |
| connection.in_buffer_size | size of the buffer to preallocate for request receive: bigger values use more RAM and less CPU | 32 * 1024 |
| connection.requests_queue_size_threshold | drop requests from handlers that allow throttling if there's more pending requests than allowed by this value | 100 |
| connection.keepalive_timeout | timeout in seconds to drop connection if there's not data received from it | 600 |
| connection.stream_close_check_delay | delay in microseconds of the start of stream close check routine; do not set if not sure what it is doing | 20ms |
| shards | how many concurrent tasks harvest data from a single socket; do not set if not sure what it is doing | - |
| middleware-pipeline-builder | name of a component to build a server-wide middleware pipeline | default-server-middleware-pipeline-builder |
Definition at line 87 of file component.hpp.
Inheritance diagram for components::Server: Collaboration diagram for components::Server:Public Member Functions | |
| Server (const components::ComponentConfig &component_config, const components::ComponentContext &component_context) | |
| void | OnAllComponentsLoaded () override |
| void | OnAllComponentsAreStopping () override |
| const server::Server & | GetServer () const |
| server::Server & | GetServer () |
| void | AddHandler (const server::handlers::HttpHandlerBase &handler, engine::TaskProcessor &task_processor) |
| Public Member Functions inherited from components::LoggableComponentBase | |
| LoggableComponentBase (const ComponentConfig &, const ComponentContext &) | |
| LoggableComponentBase (LoggableComponentBase &&)=delete | |
| LoggableComponentBase (const LoggableComponentBase &)=delete | |
| ~LoggableComponentBase () override=default | |
| ComponentHealth | GetComponentHealth () const override |
| void | OnLoadingCancelled () override |
| void | OnAllComponentsLoaded () override |
| void | OnAllComponentsAreStopping () override |
Static Public Member Functions | |
| static yaml_config::Schema | GetStaticConfigSchema () |
| Static Public Member Functions inherited from components::LoggableComponentBase | |
| static yaml_config::Schema | GetStaticConfigSchema () |
Static Public Attributes | |
| static constexpr std::string_view | kName = "server" |
| The default name of components::Server component. | |
