[Bug] 在包 org.apache.hugegraph.api.graphs 中 create 方法定义了Content-Type 为 text/plain，会导致接口返回415错误。

[chgjin]

Bug Type (问题类型)

exception / error (异常报错)

Before submit

• I had searched in the issues and found no similar issues.

Environment (环境信息)

• Server Version: v1.7.0
• Toolchain Version: v1.7.0

Expected & Actual behavior (期望与实际表现)

org.apache.hugegraph.api.graphs 包的源码：

使用请求时调用接口时，响应415异常。

实际上，如果使用application/json，是可以正常创建图的。

Vertex/Edge example (问题点 / 边数据举例)

nothing

Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

nothing

[dosubot]

Hi @chgjin! I'm Dosu and I’m helping the incubator-hugegraph-toolchain team.

感谢你的报告！这确实是一个 bug。

在 GraphsAPI.java 的 create 方法中，第 77 行明确将 Content-Type 设置为 "text/plain"：

RestHeaders headers = new RestHeaders().add(RestHeaders.CONTENT_TYPE, "text/plain");

然而，HugeGraph REST API 要求所有请求使用 application/json 作为 Content-Type，这就导致了 HTTP 415 错误。

修复方案应该是将 "text/plain" 改为 "application/json"。

To reply, just mention @dosu.

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[imbajin]

Thanks for pointing it out, would u like to submit a PR to fix this issue?

[chgjin]

Thanks for pointing it out, would u like to submit a PR to fix this issue?

I have submitted a PR is #714 ,Thanks