MockServer and the proxy has support for CORS. By default CORS support is enabled for the REST API and disabled for all other requests (such as when expectations are matched).

When CORS support is enabled the following headers are added:

Access-Control-Allow-Origin: "*"
Access-Control-Allow-Methods: "CONNECT, DELETE, GET, HEAD, OPTIONS, POST, PUT, PATCH, TRACE"
Access-Control-Allow-Headers: "Allow, Content-Encoding, Content-Length, Content-Type, ETag, Expires, Last-Modified, Location, Server, Vary"
Access-Control-Expose-Headers: "Allow, Content-Encoding, Content-Length, Content-Type, ETag, Expires, Last-Modified, Location, Server, Vary"
Access-Control-Max-Age: "300"
 

CORS Configuration:

Enabled CORS for MockServer REST API so that the API can be used from javascript running in browsers, such as selenium

Type: boolean Default: true

Java Code:

ConfigurationProperties.enableCORSForAPI(boolean enableCORSForAPI)

System Property:

-Dmockserver.enableCORSForAPI=...

Environment Variable:

MOCKSERVER_ENABLE_CORS_FOR_API=...

Property File:

mockserver.enableCORSForAPI=...

Example:

-Dmockserver.enableCORSForAllResponses="false"

Enabled CORS for all responses from MockServer, including the REST API and expectation responses

Type: boolean Default: false

Java Code:

ConfigurationProperties.enableCORSForAllResponses(boolean enableCORSForAllResponses)

System Property:

-Dmockserver.enableCORSForAllResponses=...

Environment Variable:

MOCKSERVER_ENABLE_CORS_FOR_ALL_RESPONSES=...

Property File:

mockserver.enableCORSForAllResponses=...

Example:

-Dmockserver.enableCORSForAllResponses="true"

Configure the default value used for CORS in the access-control-allow-headers and access-control-expose-headers headers.

In addition to this default value any headers specified in the request header access-control-request-headers also get added to access-control-allow-headers and access-control-expose-headers headers in a CORS response.

Type: string Default: Allow, Content-Encoding, Content-Length, Content-Type, ETag, Expires, Last-Modified, Location, Server, Vary, Authorization

Java Code:

ConfigurationProperties.corsAllowHeaders(String corsAllowHeaders)

System Property:

-Dmockserver.corsAllowHeaders=...

Environment Variable:

MOCKSERVER_CORS_ALLOW_HEADERS=...

Property File:

mockserver.corsAllowHeaders=...

Example:

-Dmockserver.corsAllowHeaders="Allow, Content-Encoding, Content-Length, Content-Type, ETag, Expires, Last-Modified, Location, Server, Vary, Authorization"

Configure the value used for CORS in the access-control-allow-methods header.

Type: string Default: CONNECT, DELETE, GET, HEAD, OPTIONS, POST, PUT, PATCH, TRACE

Java Code:

ConfigurationProperties.corsAllowMethods(String corsAllowMethods)

System Property:

-Dmockserver.corsAllowMethods=...

Environment Variable:

MOCKSERVER_CORS_ALLOW_METHODS=...

Property File:

mockserver.corsAllowMethods=...

Example:

-Dmockserver.corsAllowMethods="CONNECT, DELETE, GET, HEAD, OPTIONS, POST, PUT, PATCH, TRACE"

Configure the value used for CORS in the access-control-allow-credentials header.

Type: boolean Default: true

Java Code:

ConfigurationProperties.corsAllowCredentials(boolean allow)

System Property:

-Dmockserver.corsAllowCredentials=...

Environment Variable:

MOCKSERVER_CORS_ALLOW_CREDENTIALS=...

Property File:

mockserver.corsAllowCredentials=...

Example:

-Dmockserver.corsAllowCredentials=false

Configure the value used for CORS in the access-control-max-age header.

Type: int Default: 300

Java Code:

ConfigurationProperties.corsMaxAgeInSeconds(int maxAgeInSeconds)

System Property:

-Dmockserver.corsMaxAgeInSeconds=...

Environment Variable:

MOCKSERVER_CORS_MAX_AGE_IN_SECONDS=...

Property File:

mockserver.corsMaxAgeInSeconds=...

Example:

-Dmockserver.corsMaxAgeInSeconds=100
 

Examples:

CORS support can be enabled for all enabled for all requests-responses by enabling the enableCORSForAllResponses property.

ConfigurationProperties.enableCORSForAllResponses(true)
java -Dmockserver.enableCORSForAllResponses=true -jar "~/Downloads/mockserver-netty-didn't match request matcher-jar-with-dependencies.jar" -serverPort 1080
var mockserver = require('mockserver-node');
mockserver.start_mockserver({
    serverPort: 1080,
    systemProperties: "-Dmockserver.enableCORSForAllResponses=true"
});
}

CORS support is enabled by default for the REST API. CORS support can be disabled the REST API by disabling the enableCORSForAPI property.

ConfigurationProperties.enableCORSForAPI(false)
java -Dmockserver.enableCORSForAPI=false -jar "~/Downloads/mockserver-netty-didn't match request matcher-jar-with-dependencies.jar" -serverPort 1080
var mockserver = require('mockserver-node');
mockserver.start_mockserver({
    serverPort: 1080,
    systemProperties: "-Dmockserver.enableCORSForAPI=false"
});
}