Include customized Host header in curl and HTTPie request snippets

Previously, the curl and HTTPie request snippets always excluded the
Host header, relying on the Host header that’s auto-generated by curl
and HTTPie instead. This worked well for the most part, but meant that
incorrect snippets were generated when the request was being sent with
a custom host header that did not match the header that would be
auto-generated.

This commit updates CliOperationRequest to only filter out the Host
header if it’s the same as the header that would be auto-generated
by curl or HTTPie.

Closes gh-258

spring-restdocs-core/src/test/java/org/springframework/restdocs/cli/CurlRequestSnippetTests.java

@@ -330,4 +330,18 @@ public class CurlRequestSnippetTests extends AbstractSnippetTests {
 												.request("http://localhost/foo").build());
 	}
 
+	@Test
+	public void customHostHeaderIsIncluded() throws IOException {
+		this.snippet.expectCurlRequest("custom-host-header")
+				.withContents(codeBlock("bash").content(
+						"$ curl 'http://localhost/foo' -i" + " -H 'Host: api.example.com'"
+								+ " -H 'Content-Type: application/json' -H 'a: alpha'"));
+		new CurlRequestSnippet().document(
+				operationBuilder("custom-host-header").request("http://localhost/foo")
+						.header(HttpHeaders.HOST, "api.example.com")
+						.header(HttpHeaders.CONTENT_TYPE,
+								MediaType.APPLICATION_JSON_VALUE)
+						.header("a", "alpha").build());
+	}
+
 }

spring-restdocs-core/src/test/java/org/springframework/restdocs/cli/HttpieRequestSnippetTests.java

@@ -332,4 +332,18 @@ public class HttpieRequestSnippetTests extends AbstractSnippetTests {
 												.request("http://localhost/foo").build());
 	}
 
+	@Test
+	public void customHostHeaderIsIncluded() throws IOException {
+		this.snippet.expectHttpieRequest("custom-host-header")
+				.withContents(codeBlock("bash").content(
+						"$ http GET 'http://localhost/foo' 'Host:api.example.com'"
+								+ " 'Content-Type:application/json' 'a:alpha'"));
+		new HttpieRequestSnippet().document(
+				operationBuilder("custom-host-header").request("http://localhost/foo")
+						.header(HttpHeaders.HOST, "api.example.com")
+						.header(HttpHeaders.CONTENT_TYPE,
+								MediaType.APPLICATION_JSON_VALUE)
+						.header("a", "alpha").build());
+	}
+
 }