dashfwd/spring-cloud-gateway-example

Spring Cloud Gateway Example

Example of using Spring Cloud Gateway

Starting the server

./gradlew bootRun

Example 1: Proxy to an image

See Application.kt for the code related to this example.

Example proxying an image to Wikipedia

Example 2: Proxy to an image by rewriting the URL

See Application.kt for the code related to this example.

Example proxying an image to Wikipedia

Example 3: Proxy to and endpoint and add a header

See Application.kt for the code related to this example.

curl 'http://localhost:8080/get?&hello=there'

Should proxy to httpbin.com and output the query parameters in the args element as well as the headers. Notes the addition of the "Hello" header:

{
    "args": {
        "hello": "there"
    },
    "headers": {
        "Accept": "*/*",
        "Content-Length": "0",
        "Forwarded": "proto=http;host=\"localhost:8080\";for=\"0:0:0:0:0:0:0:1:58106\"",
        "Hello": "World",
        "Host": "httpbin.org",
        "User-Agent": "curl/7.64.1",
        "X-Amzn-Trace-Id": "Root=1-60eca8f4-054b3bd44e5e313963920d64",
        "X-Forwarded-Host": "localhost:8080"
    },
    "origin": "0:0:0:0:0:0:0:1, 34.236.252.22",
    "url": "https://localhost:8080/get?hello=there"
}

Example 4: Wildcard matching using AntPathMatcher.

See Application.kt for the code related to this example.

So far all the examples have only shown proxying to a single URL. What if you wanted to proxy to multiple URLs using a common prefix? You can do that because all paths are in AntPathMatcher format

For this example, any path starting with /base64/ is proxied to HTTPBin.

The /base64/{valuee} endpoint is documented at HTTPBin here.

For example try this.

Example 5: Redirects

See RedirectFilter.kt

Both the home page and /tree will redirect to the /tree.jpg image.