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docs/features/interceptors.md

Symmetrically, interceptors can rewrite response headers and transform the response body. This is generally more dangerous than rewriting request headers because it may violate the webserver's expectations!

If you're in a tricky situation and prepared to deal with the consequences, rewriting response headers is a powerful way to work around problems. For example, you can fix a server's misconfigured `Cache-Control` response header to enable better response caching:

Created: Fri Apr 03 11:42:14 GMT 2026

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github.com/codelibs/fess

src/main/webapp/WEB-INF/view/admin/group/admin_group_details.jsp

                                <%-- Card Header --%>
                            <div class="card-header">
                                <jsp:include page="/WEB-INF/view/common/admin/crud/header.jsp"></jsp:include>
                            </div>
                                <%-- Card Body --%>

Created: Tue Mar 31 13:07:34 GMT 2026

- Last Modified: Mon Feb 23 08:03:44 GMT 2026

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github.com/tiangolo/fastapi

docs_src/response_directly/tutorial002_py310.py

from fastapi import FastAPI, Response

app = FastAPI()


@app.get("/legacy/")
def get_legacy_data():
    data = """<?xml version="1.0"?>
    <shampoo>
    <Header>
        Apply shampoo here.
    </Header>
    <Body>
        You'll have to use soap here.
    </Body>
    </shampoo>
    """

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Thu Feb 12 13:19:43 GMT 2026

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github.com/minio/minio

cmd/object-api-options.go

)

func getDefaultOpts(header http.Header, copySource bool, metadata map[string]string) (opts ObjectOptions, err error) {
	var clientKey [32]byte
	var sse encrypt.ServerSide

	opts = ObjectOptions{UserDefined: metadata}
	if v, ok := header[xhttp.MinIOSourceProxyRequest]; ok {
		opts.ProxyHeaderSet = true
		opts.ProxyRequest = strings.Join(v, "") == "true"
	}
	if _, ok := header[xhttp.MinIOSourceReplicationRequest]; ok {

Created: Sun Apr 05 19:28:12 GMT 2026

- Last Modified: Sun Sep 28 20:59:21 GMT 2025

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github.com/minio/minio

cmd/object-handlers-common.go

}

// setPutObjHeaders sets all the necessary headers returned back
// upon a success Put/Copy/CompleteMultipart/Delete requests
// to activate delete only headers set delete as true
func setPutObjHeaders(w http.ResponseWriter, objInfo ObjectInfo, del bool, h http.Header) {
	// We must not use the http.Header().Set method here because some (broken)
	// clients expect the ETag header key to be literally "ETag" - not "Etag" (case-sensitive).

Created: Sun Apr 05 19:28:12 GMT 2026

- Last Modified: Wed Jul 23 12:36:06 GMT 2025

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github.com/square/okhttp

okhttp/src/commonJvmAndroid/kotlin/okhttp3/internal/http2/PushObserver.kt

    private class PushObserverCancel : PushObserver {
      override fun onRequest(
        streamId: Int,
        requestHeaders: List<Header>,
      ): Boolean = true

      override fun onHeaders(
        streamId: Int,
        responseHeaders: List<Header>,
        last: Boolean,
      ): Boolean = true

      @Throws(IOException::class)
      override fun onData(
        streamId: Int,

Created: Fri Apr 03 11:42:14 GMT 2026

- Last Modified: Wed Mar 19 19:25:20 GMT 2025

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github.com/tiangolo/fastapi

docs_src/header_param_models/tutorial001_an_py310.py

from fastapi import FastAPI, Header
from pydantic import BaseModel

app = FastAPI()


class CommonHeaders(BaseModel):
    host: str
    save_data: bool
    if_modified_since: str | None = None
    traceparent: str | None = None
    x_tag: list[str] = []


@app.get("/items/")
async def read_items(headers: Annotated[CommonHeaders, Header()]):

Created: Sun Apr 05 07:19:11 GMT 2026

- Last Modified: Tue Sep 17 18:54:10 GMT 2024

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github.com/minio/minio

internal/http/server.go

		// If server is in shutdown.
		if atomic.LoadUint32(&srv.inShutdown) != 0 {
			// To indicate disable keep-alive, server is shutting down.
			w.Header().Set("Connection", "close")

			// Add 1 minute retry header, incase-client wants to honor it
			w.Header().Set(RetryAfter, "60")

			w.WriteHeader(http.StatusServiceUnavailable)
			w.Write([]byte(http.ErrServerClosed.Error()))
			return
		}

Created: Sun Apr 05 19:28:12 GMT 2026

- Last Modified: Sun Sep 28 20:59:21 GMT 2025

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github.com/minio/minio

cmd/handler-utils.go

		return map[string]string{}
	}
	return map[string]string{
		"requestId":      w.Header().Get(xhttp.AmzRequestID),
		"nodeId":         w.Header().Get(xhttp.AmzRequestHostID),
		"content-length": w.Header().Get(xhttp.ContentLength),
		// Add more fields here.
	}
}

// Trims away `aws-chunked` from the content-encoding header if present.
// Streaming signature clients can have custom content-encoding such as

Created: Sun Apr 05 19:28:12 GMT 2026

- Last Modified: Sun Sep 28 20:59:21 GMT 2025

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github.com/codelibs/fess

src/test/java/org/codelibs/fess/it/search/SuggestWordsApiTests.java

    }

    @Test
    public void testSuggestWords_ok() {
        Map<String, String> params = new HashMap<>();
        params.put("q", "test");

        given().contentType("application/json")
                .header("Referer", getFessUrl())
                .params(params)
                .when()
                .get("/api/v1/suggest-words")
                .then()
                .statusCode(200)

Created: Tue Mar 31 13:07:34 GMT 2026

- Last Modified: Sat Dec 20 03:03:44 GMT 2025

- 5.7K bytes

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