I want to fetch some data based on the visited url of my blog website . This is the query I am using in the pages I'd like to fetch the data :

export const query = graphql`
  query BlogPostQuery($uid: String) {
   prismicBlog(uid: { eq: $uid }) {
      uid
    }
  }
`

This also returns a JSON format in my GraphiQL :

{
  "data": {
    "prismicBlog": {
      "uid": "last04"
    }
  },
  "extensions": {}
}

Eventually , this returns only one uid and it's the first uid in my Prismic CMS , so it doesn't fetch data accordingly of the visited url. Any idea how to solve this ?