## Proxy with a stripped path prefix

Having a proxy with a stripped path prefix, in this case, means that you could declare a path at `/app` in your code, but then, you add a layer on top (the proxy) that would put your **FastAPI** application under a path like `/api/v1`.

In this case, the original path `/app` would actually be served at `/api/v1/app`.

Even though all your code is written assuming there's just `/app`.

    private static final String FESS_CONTEXT_PATH = "fess.context.path";

    private static final String FESS_PORT = "fess.port";

    private static final String FESS_TEMP_PATH = "fess.temp.path";

    private static final String FESS_VAR_PATH = "fess.var.path";

    private static final String FESS_WEBAPP_PATH = "fess.webapp.path";

    private static final String JAVA_IO_TMPDIR = "java.io.tmpdir";

{!> ../../docs_src/header_params/tutorial001.py!}
```

////

/// note | "Technical Details"

`Header` is a "sister" class of `Path`, `Query` and `Cookie`. It also inherits from the same common `Param` class.

But remember that when you import `Query`, `Path`, `Header`, and others from `fastapi`, those are actually functions that return special classes.

///

/// info

        Path path = locateExistingPom(projectDirectory.toPath());
        return path != null ? path.toFile() : null;
    }

    @Override
    public Path locateExistingPom(Path projectDirectory) {
        // Note that the ModelProcessor#locatePom never returns null
        // while the ModelParser#locatePom needs to return an existing path!
        Path pom = modelParsers.stream()

            return path;
        }

        try {
            final StringBuilder buf = new StringBuilder(path.length() + 100);
            for (int i = 0; i < path.length(); i++) {
                final char c = path.charAt(i);
                if (CharUtil.isUrlChar(c) || c == '^' || c == '{' || c == '}' || c == '|' || c == '\\') {
                    buf.append(c);
                } else {

    }

    /**
     * Returns the path to the pom file for this project.
     * A project is usually read from a file named {@code pom.xml},
     * which contains the {@linkplain #getModel() model} in an XML form.
     * When a custom {@code org.apache.maven.api.spi.ModelParser} is used,
     * the path may point to a non XML file.
     * <p>
     * The POM path is also used to define the {@linkplain #getBasedir() base directory}

			Description: `namespace prefix to isolate tenants` + defaultHelpPostfix(PathPrefix),
			Optional:    true,
			Type:        "path",
		},
		config.HelpKV{
			Key:         CoreDNSPath,
			Description: `shared bucket DNS records` + defaultHelpPostfix(CoreDNSPath),
			Optional:    true,
			Type:        "path",
		},
		config.HelpKV{
			Key:         ClientCert,

    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/items/{item_id}": {
                "get": {
                    "responses": {
                        "200": {
                            "description": "Successful Response",

         */
        @Nullable
        Path locateExistingPom(@Nonnull Path project);
    }

    @Nullable
    ModelSource resolve(@Nonnull ModelLocator modelLocator, @Nonnull String relative);

    @Nonnull
    static ModelSource fromPath(@Nonnull Path path) {
        return fromPath(path, null);
    }

    @Nonnull
    static ModelSource fromPath(@Nonnull Path path, @Nullable String location) {

              <exclude>org.apache.maven.model.path.DefaultModelPathTranslator#setPathTranslator(org.apache.maven.model.path.PathTranslator):METHOD_REMOVED</exclude>
              <exclude>org.apache.maven.model.path.DefaultModelPathTranslator#DefaultModelPathTranslator():CONSTRUCTOR_REMOVED</exclude>
              <exclude>org.apache.maven.model.path.DefaultModelUrlNormalizer#setUrlNormalizer(org.apache.maven.model.path.UrlNormalizer):METHOD_REMOVED</exclude>