Configuring an Instance of ObsClient

If you have any questions during development, post them on the Issues page of GitHub. For details about parameters and usage of each API, see the .

When you call the ObsConfiguration configuration class to create an instance of ObsClient, you can configure the agent, timeout duration, maximum allowed number of connections, and some other parameters listed in the following table.

Parameter	Description	Method	Recommended Value
connectionTimeout	Timeout period for establishing an HTTP/HTTPS connection, in ms. The default value is 60000.	ObsConfiguration.setConnectionTimeout	[10000, 60000]
socketTimeout	Timeout duration for transmitting data at the Socket layer, in ms. The default value is 60000.	ObsConfiguration.setSocketTimeout	[10000, 60000]
idleConnectionTime	Allowed connection idle time, in ms. If a connection exceeds the specified value, the connection will be closed. The default value is 30000.	ObsConfiguration.setIdleConnectionTime	Default value
maxIdleConnections	Maximum number of allowed idle connections in the connection pool. The default value is 1000.	ObsConfiguration.setMaxIdleConnections	N/A
maxConnections	Maximum number of concurrent HTTP requests. The default value is 1000.	ObsConfiguration.setMaxConnections	Default value
maxErrorRetry	Maximum number of retry attempts (caused by abnormal requests, 500, 503, and other errors). The default value is 3. NOTE: This parameter is invalid in object upload and download APIs if an interruption occurs after an upload or download task enters the data flow processing phase. In this case, no retry is performed.	ObsConfiguration.setMaxErrorRetry	[0, 5]
endPoint	Endpoint for accessing OBS, which contains the protocol type, domain name (or IP address), and port number. For example, https://your-endpoint:443. For security purposes, you are advised to use HTTPS.	ObsConfiguration.setEndPoint	N/A
httpProxy	HTTP proxy configuration. This parameter is left blank by default.	ObsConfiguration.setHttpProxy	N/A
validateCertificate	Whether to verify the server certificate. The default value is false.	ObsConfiguration.setValidateCertificate	N/A
verifyResponseContentType	Whether to verify ContentType of the response header. The default value is true.	ObsConfiguration.setVerifyResponseContentType	Default value
uploadStreamRetryBufferSize	Size of the cache used for uploading a stream object, in bytes. The default size is 512 KB.	ObsConfiguration.setUploadStreamRetryBufferSize	N/A
readBufferSize	Cache size for downloading the object from socket streams, in bytes. Value -1 indicates that cache is not configured. The default value is -1.	ObsConfiguration.setReadBufferSize	N/A
writeBufferSize	Cache size for uploading the object to socket streams, in bytes. Value -1 indicates that cache is not configured. The default value is -1.	ObsConfiguration.setWriteBufferSize	N/A
socketWriteBufferSize	Buffer size for sending a socket, in bytes. This parameter corresponds to java.net.SocketOptions.SO_SNDBUF. The default value is -1, which indicates no limitation.	ObsConfiguration.setSocketWriteBufferSize	Default value
socketReadBufferSize	Buffer size for receiving a socket, in bytes. This parameter corresponds to java.net.SocketOptions.SO_RCVBUF. The default value is -1, which indicates no limitation.	ObsConfiguration.setSocketReadBufferSize	Default value
keyManagerFactory	Factory used for generating javax.net.ssl.KeyManager. This parameter is left blank by default.	ObsConfiguration.setKeyManagerFactory	N/A
trustManagerFactory	Factory used for generating javax.net.ssl.TrustManager. This parameter is left blank by default.	ObsConfiguration.setTrustManagerFactory	N/A
isStrictHostnameVerification	Whether to strictly verify the server-side host name. The default value is false.	ObsConfiguration.setIsStrictHostnameVerification	N/A
keepAlive	Whether to use persistent connections to access OBS. The default value is true.	ObsConfiguration.setKeepAlive	N/A
cname	Whether to use self-defined domain name to access OBS. The default value is false.	ObsConfiguration.setCname	N/A
sslProvider	Provider of SSLContext. The SSLContext provided by JDK is used by default.	ObsConfiguration.setSslProvider	N/A
httpProtocolType	HTTP protocol type used for accessing OBS servers. The default protocol is HTTP 1.1.	ObsConfiguration.setHttpProtocolType	N/A
httpDispatcher	Customized dispatcher	ObsConfiguration.setHttpDispatcher	N/A

Parameters whose recommended value is N/A need to be set according to the actual conditions.
To improve the upload and download performance of large files in the case that the network bandwidth meets the requirements, you can tune the socketWriteBufferSize, sockeReadBufferSize, readBufferSize, and writeBufferSize parameters.
If the network is unstable, you are advised to set larger values for connectionTimeout and socketTimeout.
If the value of endPoint does not contain any protocol, HTTPS is used by default.
For the sake of high DNS resolution performance and OBS reliability, you can set endPoint only to the domain name of OBS, instead of the IP address.