src/core/lib/http/httpcli.c - platform/external/grpc-grpc - Gitiles

 /*
  *
  * Copyright 2015, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */

 #include "src/core/lib/http/httpcli.h"

 #include <string.h>

 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 #include <grpc/support/useful.h>

 #include "src/core/lib/http/format_request.h"
 #include "src/core/lib/http/parser.h"
 #include "src/core/lib/iomgr/endpoint.h"
 #include "src/core/lib/iomgr/iomgr_internal.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/iomgr/sockaddr_utils.h"
 #include "src/core/lib/iomgr/tcp_client.h"
 #include "src/core/lib/support/string.h"

 typedef struct {
   grpc_slice request_text;
   grpc_http_parser parser;
   grpc_resolved_addresses *addresses;
   size_t next_address;
   grpc_endpoint *ep;
   char *host;
   char *ssl_host_override;
   gpr_timespec deadline;
   int have_read_byte;
   const grpc_httpcli_handshaker *handshaker;
   grpc_closure *on_done;
   grpc_httpcli_context *context;
   grpc_polling_entity *pollent;
   grpc_iomgr_object iomgr_obj;
   grpc_slice_buffer incoming;
   grpc_slice_buffer outgoing;
   grpc_closure on_read;
   grpc_closure done_write;
   grpc_closure connected;
   grpc_error *overall_error;
   grpc_resource_quota *resource_quota;
 } internal_request;

 static grpc_httpcli_get_override g_get_override = NULL;
 static grpc_httpcli_post_override g_post_override = NULL;

 static void plaintext_handshake(grpc_exec_ctx *exec_ctx, void *arg,
                                 grpc_endpoint *endpoint, const char *host,
                                 gpr_timespec deadline,
                                 void (*on_done)(grpc_exec_ctx *exec_ctx,
                                                 void *arg,
                                                 grpc_endpoint *endpoint)) {
   on_done(exec_ctx, arg, endpoint);
 }

 const grpc_httpcli_handshaker grpc_httpcli_plaintext = {"http",
                                                         plaintext_handshake};

 void grpc_httpcli_context_init(grpc_httpcli_context *context) {
   context->pollset_set = grpc_pollset_set_create();
 }

 void grpc_httpcli_context_destroy(grpc_httpcli_context *context) {
   grpc_pollset_set_destroy(context->pollset_set);
 }

 static void next_address(grpc_exec_ctx *exec_ctx, internal_request *req,
                          grpc_error *due_to_error);

 static void finish(grpc_exec_ctx *exec_ctx, internal_request *req,
                    grpc_error *error) {
   grpc_polling_entity_del_from_pollset_set(exec_ctx, req->pollent,
                                            req->context->pollset_set);
   grpc_exec_ctx_sched(exec_ctx, req->on_done, error, NULL);
   grpc_http_parser_destroy(&req->parser);
   if (req->addresses != NULL) {
     grpc_resolved_addresses_destroy(req->addresses);
   }
   if (req->ep != NULL) {
     grpc_endpoint_destroy(exec_ctx, req->ep);
   }
   grpc_slice_unref(req->request_text);
   gpr_free(req->host);
   gpr_free(req->ssl_host_override);
   grpc_iomgr_unregister_object(&req->iomgr_obj);
   grpc_slice_buffer_destroy(&req->incoming);
   grpc_slice_buffer_destroy(&req->outgoing);
   GRPC_ERROR_UNREF(req->overall_error);
   grpc_resource_quota_internal_unref(exec_ctx, req->resource_quota);
   gpr_free(req);
 }

 static void append_error(internal_request *req, grpc_error *error) {
   if (req->overall_error == GRPC_ERROR_NONE) {
     req->overall_error = GRPC_ERROR_CREATE("Failed HTTP/1 client request");
   }
   grpc_resolved_address *addr = &req->addresses->addrs[req->next_address - 1];
   char *addr_text = grpc_sockaddr_to_uri(addr);
   req->overall_error = grpc_error_add_child(
       req->overall_error,
       grpc_error_set_str(error, GRPC_ERROR_STR_TARGET_ADDRESS, addr_text));
   gpr_free(addr_text);
 }

 static void do_read(grpc_exec_ctx *exec_ctx, internal_request *req) {
   grpc_endpoint_read(exec_ctx, req->ep, &req->incoming, &req->on_read);
 }

 static void on_read(grpc_exec_ctx *exec_ctx, void *user_data,
                     grpc_error *error) {
   internal_request *req = user_data;
   size_t i;

   for (i = 0; i < req->incoming.count; i++) {
     if (GRPC_SLICE_LENGTH(req->incoming.slices[i])) {
       req->have_read_byte = 1;
       grpc_error *err =
           grpc_http_parser_parse(&req->parser, req->incoming.slices[i], NULL);
       if (err != GRPC_ERROR_NONE) {
         finish(exec_ctx, req, err);
         return;
       }
     }
   }

   if (error == GRPC_ERROR_NONE) {
     do_read(exec_ctx, req);
   } else if (!req->have_read_byte) {
     next_address(exec_ctx, req, GRPC_ERROR_REF(error));
   } else {
     finish(exec_ctx, req, grpc_http_parser_eof(&req->parser));
   }
 }

 static void on_written(grpc_exec_ctx *exec_ctx, internal_request *req) {
   do_read(exec_ctx, req);
 }

 static void done_write(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
   internal_request *req = arg;
   if (error == GRPC_ERROR_NONE) {
     on_written(exec_ctx, req);
   } else {
     next_address(exec_ctx, req, GRPC_ERROR_REF(error));
   }
 }

 static void start_write(grpc_exec_ctx *exec_ctx, internal_request *req) {
   grpc_slice_ref(req->request_text);
   grpc_slice_buffer_add(&req->outgoing, req->request_text);
   grpc_endpoint_write(exec_ctx, req->ep, &req->outgoing, &req->done_write);
 }

 static void on_handshake_done(grpc_exec_ctx *exec_ctx, void *arg,
                               grpc_endpoint *ep) {
   internal_request *req = arg;

   if (!ep) {
     next_address(exec_ctx, req,
                  GRPC_ERROR_CREATE("Unexplained handshake failure"));
     return;
   }

   req->ep = ep;
   start_write(exec_ctx, req);
 }

 static void on_connected(grpc_exec_ctx *exec_ctx, void *arg,
                          grpc_error *error) {
   internal_request *req = arg;

   if (!req->ep) {
     next_address(exec_ctx, req, GRPC_ERROR_REF(error));
     return;
   }
   req->handshaker->handshake(
       exec_ctx, req, req->ep,
       req->ssl_host_override ? req->ssl_host_override : req->host,
       req->deadline, on_handshake_done);
 }

 static void next_address(grpc_exec_ctx *exec_ctx, internal_request *req,
                          grpc_error *error) {
   grpc_resolved_address *addr;
   if (error != GRPC_ERROR_NONE) {
     append_error(req, error);
   }
   if (req->next_address == req->addresses->naddrs) {
     finish(exec_ctx, req,
            GRPC_ERROR_CREATE_REFERENCING("Failed HTTP requests to all targets",
                                          &req->overall_error, 1));
     return;
   }
   addr = &req->addresses->addrs[req->next_address++];
   grpc_closure_init(&req->connected, on_connected, req);
   grpc_arg arg;
   arg.key = GRPC_ARG_RESOURCE_QUOTA;
   arg.type = GRPC_ARG_POINTER;
   arg.value.pointer.p = req->resource_quota;
   arg.value.pointer.vtable = grpc_resource_quota_arg_vtable();
   grpc_channel_args args = {1, &arg};
   grpc_tcp_client_connect(exec_ctx, &req->connected, &req->ep,
                           req->context->pollset_set, &args, addr,
                           req->deadline);
 }

 static void on_resolved(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
   internal_request *req = arg;
   if (error != GRPC_ERROR_NONE) {
     finish(exec_ctx, req, error);
     return;
   }
   req->next_address = 0;
   next_address(exec_ctx, req, GRPC_ERROR_NONE);
 }

 static void internal_request_begin(grpc_exec_ctx *exec_ctx,
                                    grpc_httpcli_context *context,
                                    grpc_polling_entity *pollent,
                                    grpc_resource_quota *resource_quota,
                                    const grpc_httpcli_request *request,
                                    gpr_timespec deadline, grpc_closure *on_done,
                                    grpc_httpcli_response *response,
                                    const char *name, grpc_slice request_text) {
   internal_request *req = gpr_malloc(sizeof(internal_request));
   memset(req, 0, sizeof(*req));
   req->request_text = request_text;
   grpc_http_parser_init(&req->parser, GRPC_HTTP_RESPONSE, response);
   req->on_done = on_done;
   req->deadline = deadline;
   req->handshaker =
       request->handshaker ? request->handshaker : &grpc_httpcli_plaintext;
   req->context = context;
   req->pollent = pollent;
   req->overall_error = GRPC_ERROR_NONE;
   req->resource_quota = grpc_resource_quota_internal_ref(resource_quota);
   grpc_closure_init(&req->on_read, on_read, req);
   grpc_closure_init(&req->done_write, done_write, req);
   grpc_slice_buffer_init(&req->incoming);
   grpc_slice_buffer_init(&req->outgoing);
   grpc_iomgr_register_object(&req->iomgr_obj, name);
   req->host = gpr_strdup(request->host);
   req->ssl_host_override = gpr_strdup(request->ssl_host_override);

   GPR_ASSERT(pollent);
   grpc_polling_entity_add_to_pollset_set(exec_ctx, req->pollent,
                                          req->context->pollset_set);
   grpc_resolve_address(exec_ctx, request->host, req->handshaker->default_port,
                        req->context->pollset_set,
                        grpc_closure_create(on_resolved, req), &req->addresses);
 }

 void grpc_httpcli_get(grpc_exec_ctx *exec_ctx, grpc_httpcli_context *context,
                       grpc_polling_entity *pollent,
                       grpc_resource_quota *resource_quota,
                       const grpc_httpcli_request *request,
                       gpr_timespec deadline, grpc_closure *on_done,
                       grpc_httpcli_response *response) {
   char *name;
   if (g_get_override &&
       g_get_override(exec_ctx, request, deadline, on_done, response)) {
     return;
   }
   gpr_asprintf(&name, "HTTP:GET:%s:%s", request->host, request->http.path);
   internal_request_begin(exec_ctx, context, pollent, resource_quota, request,
                          deadline, on_done, response, name,
                          grpc_httpcli_format_get_request(request));
   gpr_free(name);
 }

 void grpc_httpcli_post(grpc_exec_ctx *exec_ctx, grpc_httpcli_context *context,
                        grpc_polling_entity *pollent,
                        grpc_resource_quota *resource_quota,
                        const grpc_httpcli_request *request,
                        const char *body_bytes, size_t body_size,
                        gpr_timespec deadline, grpc_closure *on_done,
                        grpc_httpcli_response *response) {
   char *name;
   if (g_post_override &&
       g_post_override(exec_ctx, request, body_bytes, body_size, deadline,
                       on_done, response)) {
     return;
   }
   gpr_asprintf(&name, "HTTP:POST:%s:%s", request->host, request->http.path);
   internal_request_begin(
       exec_ctx, context, pollent, resource_quota, request, deadline, on_done,
       response, name,
       grpc_httpcli_format_post_request(request, body_bytes, body_size));
   gpr_free(name);
 }

 void grpc_httpcli_set_override(grpc_httpcli_get_override get,
                                grpc_httpcli_post_override post) {
   g_get_override = get;
   g_post_override = post;
 }
	/*
	*
	* Copyright 2015, Google Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*/

	#include "src/core/lib/http/httpcli.h"

	#include <string.h>

	#include <grpc/support/alloc.h>
	#include <grpc/support/log.h>
	#include <grpc/support/string_util.h>
	#include <grpc/support/useful.h>

	#include "src/core/lib/http/format_request.h"
	#include "src/core/lib/http/parser.h"
	#include "src/core/lib/iomgr/endpoint.h"
	#include "src/core/lib/iomgr/iomgr_internal.h"
	#include "src/core/lib/iomgr/resolve_address.h"
	#include "src/core/lib/iomgr/sockaddr_utils.h"
	#include "src/core/lib/iomgr/tcp_client.h"
	#include "src/core/lib/support/string.h"

	typedef struct {
	grpc_slice request_text;
	grpc_http_parser parser;
	grpc_resolved_addresses *addresses;
	size_t next_address;
	grpc_endpoint *ep;
	char *host;
	char *ssl_host_override;
	gpr_timespec deadline;
	int have_read_byte;
	const grpc_httpcli_handshaker *handshaker;
	grpc_closure *on_done;
	grpc_httpcli_context *context;
	grpc_polling_entity *pollent;
	grpc_iomgr_object iomgr_obj;
	grpc_slice_buffer incoming;
	grpc_slice_buffer outgoing;
	grpc_closure on_read;
	grpc_closure done_write;
	grpc_closure connected;
	grpc_error *overall_error;
	grpc_resource_quota *resource_quota;
	} internal_request;

	static grpc_httpcli_get_override g_get_override = NULL;
	static grpc_httpcli_post_override g_post_override = NULL;

	static void plaintext_handshake(grpc_exec_ctx exec_ctx, void arg,
	grpc_endpoint endpoint, const char host,
	gpr_timespec deadline,
	void (on_done)(grpc_exec_ctx exec_ctx,
	void *arg,
	grpc_endpoint *endpoint)) {
	on_done(exec_ctx, arg, endpoint);
	}

	const grpc_httpcli_handshaker grpc_httpcli_plaintext = {"http",
	plaintext_handshake};

	void grpc_httpcli_context_init(grpc_httpcli_context *context) {
	context->pollset_set = grpc_pollset_set_create();
	}

	void grpc_httpcli_context_destroy(grpc_httpcli_context *context) {
	grpc_pollset_set_destroy(context->pollset_set);
	}

	static void next_address(grpc_exec_ctx exec_ctx, internal_request req,
	grpc_error *due_to_error);

	static void finish(grpc_exec_ctx exec_ctx, internal_request req,
	grpc_error *error) {
	grpc_polling_entity_del_from_pollset_set(exec_ctx, req->pollent,
	req->context->pollset_set);
	grpc_exec_ctx_sched(exec_ctx, req->on_done, error, NULL);
	grpc_http_parser_destroy(&req->parser);
	if (req->addresses != NULL) {
	grpc_resolved_addresses_destroy(req->addresses);
	}
	if (req->ep != NULL) {
	grpc_endpoint_destroy(exec_ctx, req->ep);
	}
	grpc_slice_unref(req->request_text);
	gpr_free(req->host);
	gpr_free(req->ssl_host_override);
	grpc_iomgr_unregister_object(&req->iomgr_obj);
	grpc_slice_buffer_destroy(&req->incoming);
	grpc_slice_buffer_destroy(&req->outgoing);
	GRPC_ERROR_UNREF(req->overall_error);
	grpc_resource_quota_internal_unref(exec_ctx, req->resource_quota);
	gpr_free(req);
	}

	static void append_error(internal_request req, grpc_error error) {
	if (req->overall_error == GRPC_ERROR_NONE) {
	req->overall_error = GRPC_ERROR_CREATE("Failed HTTP/1 client request");
	}
	grpc_resolved_address *addr = &req->addresses->addrs[req->next_address - 1];
	char *addr_text = grpc_sockaddr_to_uri(addr);
	req->overall_error = grpc_error_add_child(
	req->overall_error,
	grpc_error_set_str(error, GRPC_ERROR_STR_TARGET_ADDRESS, addr_text));
	gpr_free(addr_text);
	}

	static void do_read(grpc_exec_ctx exec_ctx, internal_request req) {
	grpc_endpoint_read(exec_ctx, req->ep, &req->incoming, &req->on_read);
	}

	static void on_read(grpc_exec_ctx exec_ctx, void user_data,
	grpc_error *error) {
	internal_request *req = user_data;
	size_t i;

	for (i = 0; i < req->incoming.count; i++) {
	if (GRPC_SLICE_LENGTH(req->incoming.slices[i])) {
	req->have_read_byte = 1;
	grpc_error *err =
	grpc_http_parser_parse(&req->parser, req->incoming.slices[i], NULL);
	if (err != GRPC_ERROR_NONE) {
	finish(exec_ctx, req, err);
	return;
	}
	}
	}

	if (error == GRPC_ERROR_NONE) {
	do_read(exec_ctx, req);
	} else if (!req->have_read_byte) {
	next_address(exec_ctx, req, GRPC_ERROR_REF(error));
	} else {
	finish(exec_ctx, req, grpc_http_parser_eof(&req->parser));
	}
	}

	static void on_written(grpc_exec_ctx exec_ctx, internal_request req) {
	do_read(exec_ctx, req);
	}

	static void done_write(grpc_exec_ctx exec_ctx, void arg, grpc_error *error) {
	internal_request *req = arg;
	if (error == GRPC_ERROR_NONE) {
	on_written(exec_ctx, req);
	} else {
	next_address(exec_ctx, req, GRPC_ERROR_REF(error));
	}
	}

	static void start_write(grpc_exec_ctx exec_ctx, internal_request req) {
	grpc_slice_ref(req->request_text);
	grpc_slice_buffer_add(&req->outgoing, req->request_text);
	grpc_endpoint_write(exec_ctx, req->ep, &req->outgoing, &req->done_write);
	}

	static void on_handshake_done(grpc_exec_ctx exec_ctx, void arg,
	grpc_endpoint *ep) {
	internal_request *req = arg;

	if (!ep) {
	next_address(exec_ctx, req,
	GRPC_ERROR_CREATE("Unexplained handshake failure"));
	return;
	}

	req->ep = ep;
	start_write(exec_ctx, req);
	}

	static void on_connected(grpc_exec_ctx exec_ctx, void arg,
	grpc_error *error) {
	internal_request *req = arg;

	if (!req->ep) {
	next_address(exec_ctx, req, GRPC_ERROR_REF(error));
	return;
	}
	req->handshaker->handshake(
	exec_ctx, req, req->ep,
	req->ssl_host_override ? req->ssl_host_override : req->host,
	req->deadline, on_handshake_done);
	}

	static void next_address(grpc_exec_ctx exec_ctx, internal_request req,
	grpc_error *error) {
	grpc_resolved_address *addr;
	if (error != GRPC_ERROR_NONE) {
	append_error(req, error);
	}
	if (req->next_address == req->addresses->naddrs) {
	finish(exec_ctx, req,
	GRPC_ERROR_CREATE_REFERENCING("Failed HTTP requests to all targets",
	&req->overall_error, 1));
	return;
	}
	addr = &req->addresses->addrs[req->next_address++];
	grpc_closure_init(&req->connected, on_connected, req);
	grpc_arg arg;
	arg.key = GRPC_ARG_RESOURCE_QUOTA;
	arg.type = GRPC_ARG_POINTER;
	arg.value.pointer.p = req->resource_quota;
	arg.value.pointer.vtable = grpc_resource_quota_arg_vtable();
	grpc_channel_args args = {1, &arg};
	grpc_tcp_client_connect(exec_ctx, &req->connected, &req->ep,
	req->context->pollset_set, &args, addr,
	req->deadline);
	}

	static void on_resolved(grpc_exec_ctx exec_ctx, void arg, grpc_error *error) {
	internal_request *req = arg;
	if (error != GRPC_ERROR_NONE) {
	finish(exec_ctx, req, error);
	return;
	}
	req->next_address = 0;
	next_address(exec_ctx, req, GRPC_ERROR_NONE);
	}

	static void internal_request_begin(grpc_exec_ctx *exec_ctx,
	grpc_httpcli_context *context,
	grpc_polling_entity *pollent,
	grpc_resource_quota *resource_quota,
	const grpc_httpcli_request *request,
	gpr_timespec deadline, grpc_closure *on_done,
	grpc_httpcli_response *response,
	const char *name, grpc_slice request_text) {
	internal_request *req = gpr_malloc(sizeof(internal_request));
	memset(req, 0, sizeof(*req));
	req->request_text = request_text;
	grpc_http_parser_init(&req->parser, GRPC_HTTP_RESPONSE, response);
	req->on_done = on_done;
	req->deadline = deadline;
	req->handshaker =
	request->handshaker ? request->handshaker : &grpc_httpcli_plaintext;
	req->context = context;
	req->pollent = pollent;
	req->overall_error = GRPC_ERROR_NONE;
	req->resource_quota = grpc_resource_quota_internal_ref(resource_quota);
	grpc_closure_init(&req->on_read, on_read, req);
	grpc_closure_init(&req->done_write, done_write, req);
	grpc_slice_buffer_init(&req->incoming);
	grpc_slice_buffer_init(&req->outgoing);
	grpc_iomgr_register_object(&req->iomgr_obj, name);
	req->host = gpr_strdup(request->host);
	req->ssl_host_override = gpr_strdup(request->ssl_host_override);

	GPR_ASSERT(pollent);
	grpc_polling_entity_add_to_pollset_set(exec_ctx, req->pollent,
	req->context->pollset_set);
	grpc_resolve_address(exec_ctx, request->host, req->handshaker->default_port,
	req->context->pollset_set,
	grpc_closure_create(on_resolved, req), &req->addresses);
	}

	void grpc_httpcli_get(grpc_exec_ctx exec_ctx, grpc_httpcli_context context,
	grpc_polling_entity *pollent,
	grpc_resource_quota *resource_quota,
	const grpc_httpcli_request *request,
	gpr_timespec deadline, grpc_closure *on_done,
	grpc_httpcli_response *response) {
	char *name;
	if (g_get_override &&
	g_get_override(exec_ctx, request, deadline, on_done, response)) {
	return;
	}
	gpr_asprintf(&name, "HTTP:GET:%s:%s", request->host, request->http.path);
	internal_request_begin(exec_ctx, context, pollent, resource_quota, request,
	deadline, on_done, response, name,
	grpc_httpcli_format_get_request(request));
	gpr_free(name);
	}

	void grpc_httpcli_post(grpc_exec_ctx exec_ctx, grpc_httpcli_context context,
	grpc_polling_entity *pollent,
	grpc_resource_quota *resource_quota,
	const grpc_httpcli_request *request,
	const char *body_bytes, size_t body_size,
	gpr_timespec deadline, grpc_closure *on_done,
	grpc_httpcli_response *response) {
	char *name;
	if (g_post_override &&
	g_post_override(exec_ctx, request, body_bytes, body_size, deadline,
	on_done, response)) {
	return;
	}
	gpr_asprintf(&name, "HTTP:POST:%s:%s", request->host, request->http.path);
	internal_request_begin(
	exec_ctx, context, pollent, resource_quota, request, deadline, on_done,
	response, name,
	grpc_httpcli_format_post_request(request, body_bytes, body_size));
	gpr_free(name);
	}

	void grpc_httpcli_set_override(grpc_httpcli_get_override get,
	grpc_httpcli_post_override post) {
	g_get_override = get;
	g_post_override = post;
	}