[JAVA] Content-Type in GET call

Description

The code generated for a GET API call looks like this:

final String[] localVarContentTypes = {
};
final String localVarContentType = apiClient.selectHeaderContentType(localVarContentTypes);
localVarHeaderParams.put("Content-Type", localVarContentType);

This leads to Content-Type: application/json in the header and an empty response from the server.

Swagger-codegen version

2.3.1, 3.0.0-rc1

Swagger declaration file content or url

https://my.sevdesk.de/swaggerJSON/swagger.json

The file contains

consumes": [
    "application/x-www-form-urlencoded"
],

for the call. I deleted the lines but still have the problem that a Content-Type is put to the header.

Command line used for generation

java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i var/sevdesk_swagger.json -l java -o var/java_api_client

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

Start with the Java client generated by the supplied swagger-codegen command and inspect the GET method's header construction, especially selectHeaderContentType and the Content-Type assignment. Compare that output with the referenced Swagger declaration and its consumes value. Done means the generated GET call no longer sends an inappropriate Content-Type header and the affected response is returned correctly.