rest-assured/src/main/java/io/restassured/builder/ResponseBuilder.java
public ResponseBuilder setHeader(String name, String value) {
        notNull(name, "Header name");
        notNull(value, "Header value");

        List<Header> newHeaders = new ArrayList<Header>(restAssuredResponse.headers().asList());
        newHeaders.add(new Header(name, value));
        restAssuredResponse.setResponseHeaders(new Headers(newHeaders));

        if (trim(name).equalsIgnoreCase(CONTENT_TYPE)) {
            restAssuredResponse.setContentType(value);
        }
        return this;
    }
public ResponseBuilder setHeader(String name, String value) {
        notNull(name, "Header name");
        notNull(value, "Header value");

        List<Header> newHeaders = new ArrayList<Header>(restAssuredResponse.headers().asList());
        newHeaders.add(new Header(name, value));
        restAssuredResponse.setResponseHeaders(new Headers(newHeaders));

        if (trim(name).equalsIgnoreCase(CONTENT_TYPE)) {
            restAssuredResponse.setContentType(value);
        }
        return this;
    }
public ResponseBuilder setHeader ( String name , String value ) { notNull ( name , "Header name" ) ; notNull ( value , "Header value" ) ; List < Header > newHeaders = new ArrayList < Header > ( restAssuredResponse . headers ( ) . asList ( ) ) ; newHeaders . add ( new Header ( name , value ) ) ; restAssuredResponse . setResponseHeaders ( new Headers ( newHeaders ) ) ; if ( trim ( name ) . equalsIgnoreCase ( CONTENT_TYPE ) ) { restAssuredResponse . setContentType ( value ) ; } return this ; }
Set a specific header

@return The builder
Set a specific header