[Typescript/angular2] List<string> header parameter

Description

I've this endpoint:

@DELETE
@Path("cards")
@ApiOperation(value = "Delete cards from customer", response = String.class, responseContainer = "List")
public abstract Response deleteCards(
	@HeaderParam("user")
	@ApiParam(value = "user", required = true)
	@NotNull(message = "user.id.notnull")
		String username,
	@HeaderParam("tokens")
	@ApiParam(value = "tokens", required = true)
		List<String> tokens
) throws RepositorySystemException;

As you can see I'm setting tokens as a header parameter and it's a List.

Codegen generates well the method signature:

deleteCards(user: string, tokens: Array<string>, extraHttpRequestParams?: any): Observable<Array<string>>;

Nevertheless, it seems the code implementation there's something wrong since I receive values as a single value. So tokens parameter only has one element:

tokens => ["card_1A7ionLt2kpw3BYUiWtB7VyT,card_1A7k72Lt2kpw3BYU66JI8yat"]

instead of:

tokens => ["card_1A7ionLt2kpw3BYUiWtB7VyT", "card_1A7k72Lt2kpw3BYU66JI8yat"]

The method implementation is:

public deleteCardsWithHttpInfo(user: string, tokens: Array<string>, extraHttpRequestParams?: any): Observable<Response> {
        const path = this.basePath + `/users/cards`;

        let queryParameters = new URLSearchParams();
        let headers = new Headers(this.defaultHeaders.toJSON()); // https://github.com/angular/angular/issues/6845

        // verify required parameter 'user' is not null or undefined
        if (user === null || user === undefined) {
            throw new Error('Required parameter user was null or undefined when calling deleteCards.');
        }
        // verify required parameter 'tokens' is not null or undefined
        if (tokens === null || tokens === undefined) {
            throw new Error('Required parameter tokens was null or undefined when calling deleteCards.');
        }

        headers.set('user', String(user));
        headers.set('tokens', String(tokens));


        // to determine the Accept header
        let produces: string[] = [
            'application/json'
        ];
        
            


        let requestOptions: RequestOptionsArgs = new RequestOptions({
            method: RequestMethod.Delete,
            headers: headers,
            search: queryParameters
        });
        
        // https://github.com/swagger-api/swagger-codegen/issues/4037
        if (extraHttpRequestParams) {
            requestOptions = this.extendObj(requestOptions, extraHttpRequestParams);
        }

        return this.http.request(path, requestOptions);
    }

I think the problem is related with this line of code:

headers.set('tokens', String(tokens));

Swagger-codegen version

2.3.0-SNAPSHOT

Start with the generated deleteCardsWithHttpInfo method shown in the issue, especially the headers.set calls for the List tokens parameter. Trace the TypeScript/Angular client template that produces this code and check how list header values are represented. Done means generated requests preserve the individual token values instead of collapsing them into one comma-joined value.